To buy a shotgun in Britain you need to hold a Shotgun Certificate, and to buy a rifle you need to hold a Firearms Certificate. You can ask for forms for these from your local police station.
Ask also to speak to your local police firearms liaison officer, who will tell you what you need to fill those forms out to his or her satisfaction. They may also want to see a 'good reason' for you wanting a gun, such as membership of a clay shooting club or pest control. They usually want to see that you will keep your gun or guns in a secure place, such as a steel gun cabinet bolted to a wall. You have to store ammunition separately.
A shotgun is described as a smooth-bore gun (not being an air-weapon) which has a barrel not less than 24 inches with a bore diameter not exceeding 2 inches. A firearm usually describes a cartridge-loading, rifled-barrel longarm (rifle) with a barrel not shorter than 300mm. Overall length of the firearm must not be less than 600mm unless it is a muzzle loader. Firearms include: muzzle-loading rifles or pistols; shotguns with a magazine capacity greater than three; airguns with power ratings exceeding 12 ft/lbs for rifles and 6ft/lbs for pistols; and historic pistols kept at home as part of a collection or kept at a designated historic site and used for non-competitive target practice.
People who apply for a Firearm Certificate for a rifle or muzzle-loading pistol from 1 October 1997 need to be a member of a rifle or muzzle-loading pistol club approved by the Home Office or Scottish Office under the Firearms Acts if they intend to use the gun for target shooting only. Muzzle loaders are now the only legal useable handguns available to UK shooters (apart from the historic cartridge firing handguns kept at designated sites). However, in order to conduct your shooting you will need a supply of blackpowder which as a classified explosive, has its own restrictions requiring the acquisition of a blackpowder certificate from your police force.
You have to be aged 17 or over to have a Firearms Certificate. If you are aged less than 17 you can have a Shotgun Certificate as long as you have your parent's signed permission. You must be aged 17 or over to purchase an airgun and ammunition. If you are aged between 14 and 17 years, you may borrow a gun or have one bought for you by someone aged 17 or over, and you may use it without supervision on private property where you have a right to be. If you are under 14 you may use an airgun on private property but you must be supervised by someone over the age of 21 at all times. It is unlawful for an under-14-year-old to possess a gun and ammunition without supervision.
It is an offence to fire a gun within 50 feet of a roadway, public footpath or bridleway if by doing so any member of the public is endangered. It is an offence to carry a loaded gun in a public place without good reason. An gun may be considered loaded even if the bullets (or pellets in thecase of air rifles) are in a detached magazine.
These were just the rules we had got used to. From 1997, firearm and shotgun certification became more stringent. Among the extra hurdles, people who now apply for Firearms Certificates have to provide two referees, and the police are able to revoke a Firearms Certificate in cases where the holder no longer has a good reason to possess firearms or ammunition.
Certain types of firearm are illegal in Britain. These include automatic weapons and most handguns.