After you arrive in the UK you may need to register your stay with the police. If you need to register, this requirement will be written in your passport and you will need to register within seven days of your arrival in the United Kingdom.
To register, you will need your passport and the registration fee. Two passport-size photographs of yourself are usually also required.
The nationals of certain countries are required to register with the Police within 7 days of arrival. This is a routine procedure and should only take a few minutes.
Further details can be found: