If memory serves, LW4 was cut more by the BBFC than any other film in its year of release. I've for the US Laserdisc. Many of the cuts were soundtrack edits I think, particularly the sound of bones crunching during fight scenes.
Until I got LW on R1 DVD, I'd always assumed the UK version had been cut to shreRAB, notably during the end fight scene between Gibson and Gary Busey as the editing was a mess. But the US version was the same as the UK one.