No, I don't think so. His was the one for Fruit'n'Fibre, if I remember, when he's prancing around a golf course! But I may be wrong - can anyone else confirm this? I don't actually know who did the Bran Flakes advert - I just remember that awful tune! :-)
Definitely Bran Flakes, and it is said that the tune was written by a composer called Ronnie Bond who also wrote the Cadbury's Flake song: "Only the crumbliest flakiest chocolate", and "I'd rather have a bowl of Co-co pops"!