Number Four is a unique advisory firm

Over the last six years Jan Hall has demonstrated deep expertise and a strong track record in the following:

  • Board Performance Reviews
  • coaching those new to, or moving into Group CEO, or equivalent standalone leadership, roles
  • long term strategic Group CEO succession management
  • during times of challenges or change, working with clients to bring a trusted external perspective and to seek insights into potential enablers and un-blockers, highlighted through confidential conversations with Board and top team members

What We Do

Jan is known by our clients for our ability to:

  • see the big picture, understand the issues and “join the dots”
  • structure constructive feedback
  • frame effective ways to enable the feedback to be owned
  • identify options for moving forward in a positive way

No 4 is trusted by our clients for our total discretion, confidentiality, empathy, sensitivity and appropriate directness.


Core to the success of No 4 is drawing on best practice, collective lessons learnt and insights from CEOs and their top teams as well as Chairmen and their Boards.

We are committed to exploring how we can best add value by capturing and sharing the wisdom, insights and experience of proven leaders and experts.

Jan Hall Board & Leadership | Business Consulting Services | No.4


  • Founding Partner of No 4 and No 4’s main adviser arguably best known for having led one of the UK’s top headhunting firms. Jan worked principally on Chairman and CEO searches for a wide variety of major organisations, acting as a key strategic adviser through many challenging transitions. In 2018, after 22 years as a headhunter, she stopped all her headhunting work and will never return to this
  • for the last 20 years Jan has personally carried out Board Effectiveness Reviews, mainly for major UK FTSE businesses but also for a range of European and American companies. Today, she continues to carry out Board Reviews for FTSE 100 clients
  • Jan’s coaching is mainly in two key areas, working with those new to the Group CEO role and those soon to become a standalone CEO. Her experience and expertise in these two areas, together with her qualifications as an Executive Coach from both Meyler Campbell and the Tavistock Institute, make Jan uniquely placed to help in this major transition
  • Founder of JCA Group in 2005, which became a leading Board and Executive Search firm, based in the UK and working globally. Jan and her Partners sold the business to Heidrick & Struggles in 2016. She was their UK Chairman and Co-Leader of their European CEO and Board Practice until she left in 2018
  • 35 years experience of being a Non-Executive Director for PLC and Not for Profit Boards. Currently she is a Trustee of RUSI (Royal United Services Institute)
  • ran Directors Forum at London Business School for eight years and also taught at Oxford Saïd Business School, Warwick Business School and Ashridge Management College. During 2022 she co-led the flagship leadership programme for the Executive Pipeline which helps develop senior women to join Executive Committees and become CEOs
  • prior to her time at JCA Group, she was a Senior Partner at Spencer Stuart, the European CEO of a UK based PLC and before that, the CEO of a successful private company, having started her career as a Brand Manager for a global business
  • she studied Biochemistry at Oxford and was awarded an OBE in 1996 for her work with the Government
  • in 2012 curated Dementia Essentials, “a guide for loved ones who find themselves to be carers”.  An updated edition of her book was published in September 2020
  • Changing Gear, which she co-authored with leading psychologist and coach, Jon Stokes, was published in 2021 and moved to a paperback edition in 2022.  It is a guide to “Creating the Life You Want After a Full On Career”
Jan Hall Board & Leadership | Business Consulting Services | No.4


  • highly experienced senior level Executive Assistant
  • 11 years working as an Executive Assistant at JCA Group. Seven of these years were working with Jan Hall, and prior to that she supported other senior Consultants and Partners in the company
  • in 2016 took time away from the business to be with her young family, joining No 4 in 2018 to support Jan Hall and help run the business


T:+44 (0)20 7286 6000

4 Hamilton Close
London NW8 8QY

how to find us


Privacy Policy

What is the Privacy Notice?

This Privacy Notice (“Notice”) describes how Jan Hall Consulting Limited, trading as No. 4, collects and uses Personal Data in accordance with the EU General Data Protection Regulation (“GDPR”).


What are the aims of the Privacy Notice?

This Notice tells you what Personal Data No. 4 collects, why we need it, how we use it and what protections are in place to keep it secure.


What are the key terms?

“Jan Hall Consulting”, “No. 4”, “we”, “us” and “our” means Jan Hall Consulting Limited, trading as No. 4.

“No. 4 Personnel” means No. 4’s prospective, present and past partners, employees, consultants and agency staff, and people connected to such persons.

“Personal Data” means information about individuals (including you), and from which such individuals could be identified.

“You” means individuals whose Personal Data we process including, but not limited to job applicants, No. 4 clients, No. 4 client personnel, counter-parties, counter-party personnel, other solicitors/advisors, witnesses, suppliers, supplier personnel and individuals who visit this website.

“You” does not include No. 4 Personnel.


Who is the Data Controller?

No. 4, registered with the ICO under registration number ZA478263, is the Data Controller in relation to your Personal Data and is committed to protecting the privacy rights of individuals, including your rights.


Who is the Data Protection Manager?

No. 4 is not required under the GDPR to appoint a Data Protection Officer and, following a detailed analysis does not consider it appropriate to do so on a voluntary basis. If you wish to contact No. 4 in connection to a GDPR issue, please contact Jan Hall at


How does No. 4 obtain your Personal Data?

In most circumstances, we may obtain Personal Data from you or the data subject directly but will on occasion obtain Personal Data from a third-party source, for example, we may collect information from our clients/our clients’ personnel, agents and advisors, the company for whom you work, other organisations/persons with whom you have dealings or have had dealings with in the past, and publicly available records.


What about Personal Data which you provide to No. 4?

If you provide information to us about someone else (such as one of your associates, directors or employees, or someone with whom you have business dealings) you must ensure that you are entitled to disclose that information to us and that, without our taking any further steps, we may process that information in accordance with this Notice.   If you are in any doubt, you should take your own legal advice.


What Personal Data does No. 4 collect from and about you?

We collect and use different types of Personal Data about you, which will vary in type and detail depending on the circumstances and purpose of processing. Please consider the following illustrative and non-exhaustive examples:


  • Personal Data about you: name, address, date of birth, marital status, nationality, gender, job title, employment history, possibly about your family life;
  • Personal Data to contact you at work or home: name, address, telephone, and e-mail addresses;
  • Personal Data which may identify you, such as electronic signatures.

Why do we need to collect and use Personal Data?

We need to collect and use Personal Data for a number of reasons, the primary purpose being to contact you to advise you of upcoming events, and to provide professional services to our clients and which may involve the use of your Personal Data in the following (non-exhaustive) ways:


  • for recruitment purposes: to assess your suitability to work for No. 4, to conduct screening, assessments and interviews, to make offers and provide contracts of employment and to conduct pre-employment checks, including determining your legal right to work;
  • to contact you if you are involved in a matter we are undertaking for a client;
  • to analyse the practices of your employer or other organisations and/or persons with whom you have dealings;
  • to review, draft and disclose correspondence and other documents;
  • to instruct third-parties on behalf of our clients; and
  • for comparison/analytical purposes and to formulate opinions and provide advice.

We may also process Personal Data for effective business management purposes which may involve the use of Personal Data in the following (non-exhaustive) ways:


  • to carry out internal reviews, investigations, audits;
  • to conduct business reporting and analytics;
  • to help measure performance and improve our services;
  • for regulatory and legislative compliance and related reporting;
  • for marketing our services to you, usually by email;
  • for client satisfaction surveys; and
  • for the prevention and detection of crime.

What is No. 4’s legal basis for processing your Personal Data?

Under the GDPR, No. 4 must identify a lawful basis for processing your Personal Data which may vary according to the type of Personal Data processed and the individual to whom it relates.

Consent: we will only send you marketing emails if you have given us your prior consent unless there is another lawful basis for doing so (see also “Legitimate interests of No. 4 or a third party”).

Performance of a contract with you (where applicable): No. 4 is entitled to process the Personal Data it requires in order to fulfil its obligations under its contract with you. This will be the relevant legal basis if you are an individual client or supplier/other individual with a direct contractual relationship with No. 4.

Legitimate interests of No. 4 or a third party: No. 4 processes some Personal Data on the basis that it is necessary for its legitimate interests and/or the legitimate interests of a third-party to do so. This will primarily concern the processing of Personal Data that is necessary to provide professional advice and services to our clients. No. 4’s legitimate business interest in such instances is the proper performance of its function as a professional services provider.


No. 4’s broad interest in the provision of professional services as a basis for processing Personal Data, and our clients’ corollary interest in the receipt of such services, can be broken down into more discreet categories which may include, but are not limited, to:


  • the interest in contacting individuals relevant to No. 4’s work and our clients’ matters, which may involve the use of your Personal Data;
  • the interest in reviewing documents and correspondence that have been disclosed to No. 4, No. 4 clients and third-parties which may contain your Personal Data;
  • the interest in reviewing and analysing all information available to No 4 and its clients, which may contain your Personal Data;
  • the interest in disclosing documents and correspondence, which may contain your Personal Data, to various parties in the furtherance of No. 4’s clients’ objectives;
  • the interest in contacting individuals in a business-to-business environment or where there has been a prior contractual relationship with that individual/those individuals for the purpose of emailing them or using a postal service to notify them about our services, upcoming events and updates;
  • the interest in receiving payment from No. 4 clients and third-parties and to facilitate payments to and from No. 4 clients and third-parties; and
  • in order to allow for all of the above, the secure management and storage of your Personal Data, within our IT environment and hard-copy filing systems.
No. 4 may also process your Personal Data on the basis that it is necessary for its legitimate business interests in the effective management and running of No. 4 which may include, but is not limited to:


  • engaging suppliers and supplier personnel;
  • ensuring that its systems and premises are secure and running efficiently;
  • for regulatory and legislative compliance, and related auditing and reporting;
  • for insurance purposes; and to facilitate, make and receive payments.

No. 4 does not consider that the processing of your Personal Data, on the basis that it is necessary for No. 4’s legitimate interests (whatever such interests might be), is unwarranted because of any prejudicial effect on your rights and freedoms or your legitimate interests.


Compliance with a legal obligation to which No. 4 is subject:

In certain circumstances, No. 4 must process your Personal Data in order to comply with its legal obligations. This might include, but is not limited to, Personal Data required:


  • for tax and accounting purposes;
  • for conflict checking purposes as required by the common law;
  • for No. 4 to fulfil its compliance and other obligations under relevant legislation/regulation.

More information relating to legal bases for processing Personal Data can be found on the Information Commissioner’s website (see details below).


What will No. 4 do with special category and criminal records Personal Data?

If No. 4 processes your criminal records Personal Data or special category Personal Data relating to your racial or ethnic origin, political opinions, religious and philosophical beliefs, trade union membership, health data, biometric data or sexual orientation, we will obtain your explicit consent to those activities unless this is not required by law (because, for example, it is processed for the purpose of exercising or defending legal claims or because it may be a Home Office requirement for such information to be disclosed to the appropriate authorities when applying for a visa in relation to which we have been instructed) or the information is required to protect your health in an emergency. Where we are processing Personal Data based on your consent, you have the right to withdraw that consent at any time.


Who receives your Personal Data?

We may disclose Personal Data to third-parties (outside of Jan Hall Consulting and No. 4) if, but only when, we have a legal basis to do. Such recipients include but are not limited to:


  • third parties engaged in the course of services we provide to clients;
  • 4’s bank, auditors and accountants and other professional advisers;
  • 4’s outsourced IT providers and other suppliers;
  • HMRC;
  • Government or regulatory authorities;
  • the Home Office and Passport Services;
  • third party courier providers or postal services who deliver documents;
  • third party service providers to assist us with client insight analytics, such as Google Analytics.

How do we protect Personal Data?

We have security arrangements in place to guard against unauthorised access, improper use, alteration, destruction or accidental loss of Personal Data. We take appropriate organisational and technical security measures and have rules and procedures in place to ensure that any Personal Data we hold is not accessed by anyone unauthorised to access it.

When we use third-party organisations to process your Personal Data on our behalf, they must also have appropriate security arrangements, must comply with our contractual requirements and instructions and must ensure compliance with the GDPR and any other relevant data protection legislation.


Is your Personal Data transferred to “third countries” and, if so, what safeguards are in place?

In accordance with this Notice and the provisions of the GDPR, we may transfer your Personal Data to organisations located in “third countries” (those outside of the EEA). In addition to the security arrangements mentioned above in relation to our engagement of third-party organisations, where such transfers are required we will ensure that your Personal Data is adequately protected, for example, by using a contract for the transfer which contains specific data protection provisions that have been adopted by the European Commission or a relevant data protection authority.


How long will your Personal Data be retained by No. 4?

It is our policy to retain your Personal Data for the length of time required for the specific purposes for which it is processed by No. 4. However, we may be obliged to keep your Personal Data for a longer period, for example, where required by our legal obligations or in order to ensure we have effective back-up systems. In such cases, we will ensure that your Personal Data will continue to be treated in accordance with this Notice, restrict access to any archived Personal Data and ensure that all Personal Data is held securely and kept confidential.


What are your rights?

You have the following rights (although please note that some of these rights may be subject to restrictions):


  • to make access requests: regarding the nature of information held and to whom it has been disclosed (Data Subject Access Requests) – see below for further details;
  • to correct and delete: rectify, block, erase (including the right to be forgotten) or destroy inaccurate data;
  • to request the restriction of processing of your Personal Data. This enables you to ask us to suspend the processing of Personal Data about you, for example if you want us to establish its accuracy or the reason for processing it;
  • to prevent processing: likely to cause damage or distress, or for the purposes of direct marketing;
  • to data portability: to have personal data transmitted to another controller;
  • to complain to No. 4: relating to the processing of your personal data or the handling of requests;
  • to claim compensation: if you suffer damage by any contravention of the GDPR; and
  • to involve the ICO: to assess whether any provision of the GDPR has been contravened.

Subject Access Request 

You are entitled to make a Data Subject Access Requests (“SAR”).  Put simply, a SAR is a request made by you which requires us to provide you with details of your Personal Data which we hold and process and a description of how we process it.  Any questions should be put in writing to Jan Hall, Director (


You will not have to pay a fee to access your personal data (or to exercise any of the other rights).  However, we may charge a reasonable fee if your request for access is clearly unfounded or excessive. Alternatively, we may refuse to comply with the request in such circumstances.


We may need to request specific information from you to help us confirm your identity and ensure your right to access the information (or to exercise any of your other rights). This is another appropriate security measure to ensure that personal data is not disclosed to any person who has no right to receive it.


Right to withdraw consent 

You may withdraw your consent to allow us to continue processing your personal data, but only where consent was sought as a lawful means of processing your personal data.


In the limited circumstances where you may have provided your consent to the processing of your personal data for a specific purpose, you have the right to withdraw your consent for that specific processing at any time. To withdraw your consent, please contact Jan Hall, Director ( Once we have received notification that you have withdrawn your consent, we will no longer process your information for the purpose or purposes you originally agreed to, unless we have another legitimate basis for doing so in law.



There are exceptions to the rights of individuals in relation to their Personal Data and your rights may be limited. We will, at all times, respect your Personal Data and seek to be as transparent as possible.


How can you make a complaint?

If you are unhappy with the information provided in this Notice or have concerns about the way in which No. 4 processes your Personal Data you may in the first instance contact Jan Hall, Director (, if you remain dissatisfied then you may apply directly to the Information Commissioner for a decision. The Information Commissioner can be contacted at: -

Information Commissioner’s Office Wycliffe House Water Lane Wilmslow Cheshire SK9 5AF


What if there are any changes to this Privacy Notice?

We reserve the right to update this Notice at any time.  We encourage you to review this privacy notice periodically to be informed about how we use your Personal Data.

What We Do


Who we are


Privacy Policy