This is a picture of a inspected and approved "British standard gun cabinet. Guns and ammo are highly regulated you can only posses so much (whatever your Certificate allows), you can only buy so much per purchase (again whatever your Certificate allows and must be less then total possession allowance). and there are other rules you have to comply with. But I just thought I would share.
Source link here. Gun Safes/Cabinets - Page 3
Source link here. Gun Safes/Cabinets - Page 3