I think this was the series about a white haired garage mechanic with a moustache who was actually Merlin (the Arthurian wizard of legend) but the only person who knew about his duel identity was a boy of about 13. Each week the Kwik-fit conjurer would cast a couple of spells, mend a few rear suspensions and right wrongs etc. LOL.
Do You Remember Mr Merlin?
Do You Remember Mr Merlin?