It looks like the problem with my iBooks submission was I hadn’t included a separate cover. Which might sound like a basic sort of error but I had read the cover for iBooks should be included in the ePub file, which mine was.
It has now been resubmitted and hopefully will go through this time. 🙂
The account problem has also now been resolved and the second rogue account deleted. I must admit to being impressed by the Apple service.