Just checked my old programmes and yes, I saw him play for Utd. Long story but it was 20th Feb 1971 at Old Trafford against Southampton (I still have the programme (5p) and ticket stub (50p)).
United Team:
1.Stepney 2.Fitzpatrick 3.Burns 4.Crerand 5.Edwards 6.Sadler 7.Morgan 8.Best 9.Charlton...