Did you give references? I wonder whether a past referee is being tardy in replying to them, and they can't box-tick you as approved until that part is finished.
Hopefully - if they were genuinely worried, they'd have you off site, surely?
Unfortunately, the job involves the best part of a year's training and professional exams so there is a get-out clause covering that aspect. But this is just a case of them not looking at information that was supplied to them well before I started.
