Horace Rumpole. While the offered choices are fictional, Rumpole is carried on the official list of Barristers of the Inner Temple (one of the four Inns of Court that qualify and regulate Barristers) [not bad for one who is also a fictional character!]
I suspect that if one wanted one's solicitor to instruct Rumpole as one's barrister the brief would be submitted to John Mortimer, QC)