Thanks everyone. So apart from a Central American blip in 1966 Aer Lingus operated the quartet for twenty six years. Quite an achievement.
I know British Airways leased one of the 747s for a spell, Nigerian had a 707 and Hispania, Transair and Britannia Airways all borrowed 737-200s from time to time. Some of the 733s ended up with Futura as well. Correct me if I'm wrong but the last lease Aer Lingus did was a few A320s to Virgin Little Red.