A1.4: What is your organisation's registration number?
What is your organisation's registration number?
Source: IASME Cyber Essentials Danzell question set v16.3
A1.4 needs the registration number of the primary legal entity in A1.1, no longer than 20 characters. A UK limited company, LLP or CIC gives eight digits or a two-letter prefix and six digits, for example 01234567 or SC012345. Government bodies, sole traders, other partnerships, clubs and other organisations enter 'none'.
Is A1.4 an automatic fail?
No. A1.4 records information about your organisation and is not marked against a technical requirement, so no answer to it fails the assessment. Inaccurate or contradictory details may be returned by the assessor for correction.
- Answer type
- Notes a notes question, answered in free text
- IASME guidance
- Please enter the registered organisation number for the primary legal entity only. Your answer must not exceed 20 characters.
- Requirement enforced
- Section A1 collects the details that appear on the certificate and shape which later questions are shown.
- Outcome if non-compliant
- Not marked against a requirement; inaccurate details may be returned for correction
What does A1.4 ask?
A1.4 asks: “What is your organisation's registration number?”
A1.4 asks for your organisation's registration number. IASME's guidance says to enter it for the primary legal entity only, that it must correspond to the name in A1.1, and that it must not exceed 20 characters.
For UK companies registered at Companies House (LTD, LLP and CIC in A1.2) the number must be eight digits long, or six digits with a leading two-letter prefix such as SC for Scotland or NI for Northern Ireland. You can look it up on the Companies House register.
If you selected government agency, sole trader, other partnership, other club or society, or other organisation, enter 'none'. If your country does not issue company numbers, give another unique identifier such as a DUNS number.
What should you write in the notes field for A1.4?
Write two to four specific sentences for A1.4: what you do, who owns it, how often it happens and the record that proves it.
A model answer to adapt. Replace everything in square brackets with your own facts, and delete anything that is not true.
[Eight-digit Companies House number, e.g. 01234567, or 'none' for GOV, SOL, PRT, SOC and OTH]
What mistakes do applicants make with A1.4?
A common mistake with A1.4: dropping the leading zero from a Companies House number, so it is seven digits.
- Entering the VAT number or charity number when the entity in A1.1 is registered as a company.
- Giving the number of a parent or sister company instead of the entity named in A1.1.
- Leaving it blank for a sole trader instead of entering 'none'.
How do you get A1.4 right?
Work through these steps before you enter A1.4 in the portal:
- Copy the number from the Companies House register, keeping any leading zeros and the two-letter prefix (SC, NI) if there is one.
- Make sure it is the number of the entity in A1.1, not a parent or sister company.
- Enter 'none' if A1.2 is GOV, SOL, PRT, SOC or OTH; if your country does not issue company numbers, give another unique identifier such as a DUNS number.
How do assessors check A1.4?
What evidence should you keep for A1.4?
The self-assessment does not ask you to upload evidence, but the assessor can ask for clarification, a director signs the attestation, and Cyber Essentials Plus tests the same controls. Keep this on file for A1.4:
- The register extract showing the registration number of the entity in A1.1.
Where to go next
Other A1 questions
- A1.2A1.2Multiple choiceWhat type of organisation are you?Multiple choice
- A1.3A1.3NotesHow many employees are there in the organisation?Notes
- A1.5A1.5NotesWhat is your organisation's registered address?Notes
- A1.5.1A1.5.1NotesPlease provide the operational addresses, if different to your registered address.Notes
Frequently asked questions
A1.4 in the 2026 Danzell Cyber Essentials question set asks: "What is your organisation's registration number?" It is a notes question, answered in free text.
A1.4 needs the registration number of the primary legal entity in A1.1, no longer than 20 characters. A UK limited company, LLP or CIC gives eight digits or a two-letter prefix and six digits, for example 01234567 or SC012345. Government bodies, sole traders, other partnerships, clubs and other organisations enter 'none'.
No. A1.4 records information about your organisation and is not marked against a technical requirement, so no answer to it fails the assessment. Inaccurate or contradictory details may be returned by the assessor for correction.
On the Companies House register, on your certificate of incorporation, or on your company letterhead and website footer. It is eight digits, or two letters followed by six digits for companies registered in Scotland or Northern Ireland.
IASME's guidance says government agencies, sole traders, other partnerships, other clubs or societies and other organisations enter 'none'. Overseas organisations without a company number can give a unique identifier such as a DUNS number.
Would you pass the 2026 question set?
Answer 24 yes or no questions, built by the assessors who mark Cyber Essentials, and get a readiness score in about five minutes, with any auto-fail questions you miss flagged first in your results.
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