We mentioned on the bonus episode the extreme differences between Paul and Stephen's 1970s Penguin editions of the book and Morgan's Allison & Busby edition from 2000. The evidence is here:
What inspired the publishers to put day-glo green text on a grey background is beyond us. Believe us when we say it looks much worse in real life than this picture suggests! Allison & Busby are still publishing crime fiction, amongst other things and it appears they've got their graphic design sorted now. They don't publish any 87th Precinct novels any more.