Home Office guidance for Police states that 9mm rimfire and 410 shot pistols are allowable for humane dispatch. In practice only keepers, ghillies and deer wardens get them. Ask by all means but you'll be lucky if you get the variation. You are more likely to be told to use a sub-12 air rifle.
Ric
was told this use a sub 12-air rifle for everyday use dispatching foxes on a daily basis .only hunt terriermen and slaughtermen get them .so i have to lug around the streets of london a gun case with me everyone looking at me rather than havein a hidden pistol ?? the law is 8ollock's