There are in theory no plea deals in the UK. The police are not allowed to make promises in return for a guilty plea. The accused may have a reasonable expecta

There are in theory no plea deals in the UK. The police are not allowed to make promises in return for a guilty plea. The accused may have a reasonable expectation that they'll receive a reduced sentence from the judge in exchange for cooperating with the police; but there are no deals. The prosecutors cannot bind the judge.