Ditto for the UK. Police will revoke firearms licenses if a holder has mental health issues, and GPs have a duty to inform the police [1]. Typically a UK firearms license will only allow the holder to use a shotgun on their own land if they are a farmer, or a rifle on a certified shooting ground if the holder is a sports shooter. Some, including a friend of mine, have self certifying licenses that allow them to shoot anywhere they deem fit. Such licenses are granted to eg pest controllers who may be called in by landowners who need vermin eliminated. My friend typically drives around with his Blaser hunting rifle with telescopic sight, silencer and a box of ammo. He suffers from depression but has never sought treatment as he'd immediately lose his license.
NB many think firearms are illegal in the UK. They are not! I was surprised to discover this when I moved out of London to the countryside 10 years ago. It's very difficult to get a firearms license in an urban location. But rifles and shotguns are commonplace in rural areas. Handguns have been banned since the Dunblane massacre, and semi automatics since Hungerford. But in rural areas few dispute that shotguns and rifles are legitimate tools.
In Northern Ireland handguns are still legal but you can only have a license if the police service here deems that owning one is reasonable for the protection of your life. [0]
NB many think firearms are illegal in the UK. They are not! I was surprised to discover this when I moved out of London to the countryside 10 years ago. It's very difficult to get a firearms license in an urban location. But rifles and shotguns are commonplace in rural areas. Handguns have been banned since the Dunblane massacre, and semi automatics since Hungerford. But in rural areas few dispute that shotguns and rifles are legitimate tools.
[1] https://www.theguardian.com/society/2016/jun/22/uk-gun-licen...