Sorry, @Rodders , I never answered your question! I did get a certain amount of say in the covers, especially at the start when nobody had any idea what they might look like. I can't really draw, so I would supply stick-pictures of where the characters would go and lists of clothing etc that they might carry. There was also some discussion of style. It was always agreed that they'd have a retro, over-the-top quality, but it was the publisher's idea to make them rather like the Flashman covers in style. We tried to get the same artist, but he was ill and the chap who did the covers, Angelo Rinaldi, was quite closely linked to him. I've been very fortunate with covers.
One rather odd aspect was that chunks of the covers are drawn from "life". Wrath of the Lemming Men has a fairground in the background ("Funfare for the Common Man") that looks just like a funfare on the Australian coast (Sydney, I think). There were some odd moments of looking through the faces of models to see who would end up as Smith, Carveth and Rhianna. I don't know which toads, warthogs and upturned crabs were involved in Suruk's face.