I wonder if it's also worth trying Leicestershire Airguns. I think he's a friend of Neil's and often visits The Bash on the Sunday.....if he has them, that could be your gunshop trip from The Bash? Or, if Neil doesn't mind, he might be able to have them there for you, if he was going to the shop in the meantime?
I wonder if there's a temporary supply issue with quite a few shops being out of stock, or if they're just awaiting a new batch?