See our I’ve been Arrested! guide.
You might also want to take a look at this book by LDMG – “No Comment” – The Defendant’s Guide to Arrest.
You do not need to answer police questions, so don’t.
You don't have to give details under ANY stop and search power.
Use a recommended solicitor with protest experience.
They admit guilt for an alleged offence that might never get to court.
Ask "What power?" to challenge a police officer to act lawfully.