If you are arrested, you can see a solicitor in private, free
If you're held at a police station after arrest, you can ask to speak to a solicitor privately at any time, and the advice is free and independent of the police.
“A person arrested and held in custody in a police station or other premises shall be entitled, if he so requests, to consult a solicitor privately at any time.”
Police and Criminal Evidence Act 1984, section 58(1)
“all detainees must be informed that they may at any time consult and communicate privately with a solicitor, whether in person, in writing or by telephone, and that free independent legal advice is available.”
PACE Code C (2023), paragraph 6.1
“The advice is free and independent of the police.”
GOV.UK, Being arrested: your rights, Legal advice at the police station