Find out detailed information on you legal rights in the UK
The Home Office has published a Notice of Rights and Entitlements - Remember Your Rights Whilst Detained - this is in English but the Notice of Rights and Entitlements is available in other languages
For the Notice of Rights and Entitlements in other languages see Home Office Guidance
There is also an Easy to Ready Notice of Rights and Entitlements that aims to simplify the legal content into plain English.