And this is the final cover:
Not so cool.
They also talk about other cover-related things:
This seems as good a time as any to deal with the question raised by Jennifer about the reasoning behind publishing a book straight into paperback format and skipping the hardback completely. There are a few reasons for doing this. It might be that we have published another book by the same author and want to reissue one of their previous titles (called a backlist title) - which may have already published somewhere else, like the U.S. Or we might want to prioritise making a new author accessible to as large an audience as possible, by making it affordable. This is sometimes a great way of making a name for a debut author - encouraging people to take a punt on an unknown on the basis that it'll only cost them a fiver or so.