Your entry vignette, biometric permit or email from the Home Office will indicate if you need to register with the police.
If it says “Register/Report to Police”, “Pol. Registration” or similar, you must register with the police.
The Overseas Visitors Office (OVRO) further explains which nationals need to register, how to register and what you need to bring.
To satisfy the 7 day legal requirement to register with the police, an appointment must be booked within 7 days of arrival in the UK or within 7 days of a change in circumstance. This will ensure the requirement to register with the police has been satisfied, even if the first available appointment offered is beyond 7 days.
Police Registration guide
Guidance on completing the Pro Forma Form
Keeping your certificate up to date