The ending in the novel has "the final programme" combining the Cornelius and Miss Brunner character into a single creature, a bisexual Messiah who leads the entire population of Europe into the Mediterranean and oblivion. That would indeed have been tricky to film as described in the novel!! The film's ending is less ambitious: their combined bodies form a shaggy neanderthal who winks into the camera and does a Humphrey Bogart imitation!

Maybe Moorcock simply lacked a sense of humour! I don't think the film is half as bad as Moorcock makes out, I can kind of see where he is coming from in his criticism but as you say (D.cairns) very difficult set of novels to film and transfer to screen. I would quite like to watch it again, haven't seen it in more than 25 years!