UK schools don't hold students back
How the hell has Grayson been 'held back five years' when no school in the UK does that? There's no such thing as twenty-odd year olds running around schools as students (not legally anyway.)
I know the show has never been realistic, but it's been hard enough to except that ''special K'' never have any other lesson than History and apparently no other teacher, without having to accept this now as well.
Plus, if Grayson is an adult then why is no one bothered about him making out with a 15/16 year old Michael in the Christmas Special? And why has no one referenced the fact that Grayson came out of the closet- why is this series all about Alfie and his boring girlfriend (again)?