Yet Hammer ran after him, throwing wads of cash at him, why wouldn't he do it...?
Actually, from what I've read one of the reasons that Lee didn't want to do this film was that Hammer did not throw wads of cash at him, i.e. they didn't want to pay his going rate. Rather they "blackmailed" him into coming back by telling him how many people he would put out of a job if he didn't.
It was quite a bit gorier than I had expected, given that it was on Yves' grandchildren's top lists.