In British legal history has anyone ever admitted guilt for a crime and been convicted for it. . .............?

John Joseph Boyle v HMA 1976 JC 32 - an army deserter pled guilty to a bank robbery of which he was innocent, in order to avoid being sent back into army detention, as he wanted to spend his time in a civilian jail. Crown accepted that he was wholly innocent and that there had been a miscarriage of justice, and conviction was quashed