Dave Laing and Richard Newman's history of Cambridge FF, published for Cambridge's 30th, states that Derek Brimstone won (according to recollections of judge Pete Sayers) but there were 6 categories.
Concertina players from Bury (assuming that's Bury Lancs, not Bury St Edmunds) in that era might have been Bernard Wrigley (actually, he's from Bolton), Lee Nicholson, Dave Brooks...
Derek