A few of Optimum's recent titles have received cuts. Some of the westerns (
Soldier Blue,
Navajo Joe etc) have had the usual horsefall trims (although
Soldier Blue finally restores all the previously cut violence) and the
Black Emanuelle films have been cut to avoid R18 ratings.
The main 3 targets for the BBFC these days are consensual rape scenes, strong sexualised violence (inc torture etc) and animal cruelty.
Caligula didn't have any of these (it's about all it didn't have though)
though the passing of the hardcore scenes in an 18 is still pretty astonishing stuff.