
As I understand it they sit several times a month and if you have a longer wait it is either due to some issue or them having too many in to do in one go so are held until next session.
The procedure notes do say they aim to score in around three weeks from submission.
A friend recently waited a very long time and on checking it turned out there was an issue with the formatting of the digital x-rays.
Moral is contact your vet to contract BVA if nothing back in 21 days.