My cert says 2x .22 nothing about LR or WMR or any thing, but the way the police look at it, so an ex FEO told me is that if you put 22 lr on your application and cert arrives saying just.22, then you purchase a WMR, you knowingly purchased a rifle that you did not have authority to buy and they will then look to revoke your licence as you intentienatly tried to swivel the system. I don't know if it's true but it makes sense to me. Also no rfd in their right mind would sell you a 22-250 if your cert said .22.