Many thanks for these updates. Phew, exactly what I was hoping for! My memory may have been good on such burning issues, but not that good it seems! I'll update the database and produce a revised version for this earlier period shortly.
I am still reasonably confident that Jim Bent refereed the Wolves v Villa game in May 1978. I recall a photo showing a referee with a beard (Jim rather than John) and there was a newspaper report linking Jim's last game in the middle with his Cup Final appearance as a linesman just four days later.
I thought Bill Clements retired after the FA Cup Final in 1965 but yes, he certainly refereed at Anfield twice the following season, and I have deleted him from the database. Ken Dagnall was another who I thought retired after an FA Cup Final appearance (1967), but the Liverpool archive website shows that he refereed Liverpool v Man Utd on 6th April 1968, although I am not sure whether this would have been his last game.
Couple more from this earlier period:
G Jones - Darlington v Hartlepool, Apr 1972 (fairly confident on this although I can't think why)
L Hayes - did we not have a photo on the old ISOR of Les refereeing his final game in May 1977, but where was it?
Thanks again, keep these updates coming and more from me shortly.