I have a Weihrauch HW97K sub 12ft/lb and I would not want to be shot with it. It would definitely kill someone, no doubt about it.

I've not looked into it so not sure what the licensing thoughts are but don't forget there's a huge difference between a shotgun licence and an FAC for example. The shotgun licence is a right and the authorities need to show why you should NOT have one (I know about the circumstances that preclude it, certain jail sentences, mental health etc) whereas the FAC is a privilege and the onus is on the person wanting it to prove why they should have one. Lots and lots of stipulation on categories and conditions on an FAC too and things can be removed if they are not used and so on. Far more difficult to get and if air rifles go this way it will be a challenge for a lot of folk saying why they want one.