You forgot Bill Nicholson. The manager of the first double winning side back in the Sixties, three FA Cups including two in a row, two League Cups and the manager of the first British side to win a major European trophy, the European Cup Winners Cup in 1963 and the UEFA Cup in '72. He would have won the European Cup as well in '62 long before Celtic and Man Utd if it hadn't been for some very dodgy decisions by the referee in the semi-final against Juventus or was it Inter-Milan. Can't remember, but Bill Nicholson is definitely up there with the best of them and he won it all playing stylish attacking football.