Right to Remain Toolkit
The fantastic organisation Right to Remain have published their Toolkit for migrants seeking to understand and defend their legal position in the UK. It is a great resource and I can highly recommend it:
The Right to Remain Toolkit is a guide to the UK immigration and asylum system. It gives an overview of the legal system and procedures, with detailed information on rights and options at key stages, and actions you can take in support of your claim, or to help someone else.