Just to clarify to comply with home office guidance you either need two individual locks or it can be secured by just one lock to BS 362 using the methods a) b)or c) below.
“8. Hinged full-length doors for rifles/shotguns, should be fitted with two locking devices fitted
at points to divide the locking edge into equal parts. Alternatively, the door may have a driven
bolt/multi-point locking system, either key or lever operated, providing:
a) three bolts operating equally along the opening edge or opening edge, top and bottom;
b ) the bolts to provide resistance equal to that in BS3621;
c) a lever driven system to be secured by a lock to BS3621 or equivalent (see illustration
5 & illustration 6).”
You can also use a cabinet certified to BS 7558.
BS 7558 is mainly about the method of attack testing, basically can it withstand a 5 minute attack from common hand-tools.
The tools listed are Club hammer 1.8 kg, Flat cold chisel overall length 200 mm and blade width 25 mm, Jemmy.
The only mention of the construction of the cabinet regarding locks in BS7558 is.
“It shall be possible to lock the gun cabinet by means of one or more secure locks or close shackle padlocks of not less than 1 000 differs. Padlock shackles shall be hardened.”
The reasoning behind an attack test rather than specification on design including number of locks was because it was demonstrated that a specification which centred only on the design and construction features of a gun cabinet was insufficient to provide adequate resistance to sustained forcible attack. Cabinets made to the most stringent existing design and construction requirements still provided points of weakness which could be breached in less than 1 min by the methods of physical attack described in the standard.
So for BS 7558 you can build your cabinet to whatever spec you want as long as you take into account the notes listed in section 4 construction (regarding locks the requirement is not less than 1 000 differs but no mention of number of locks required) and send it of for independent testing.
If it then passes attack test it is a cabinet to BS 7558 no matter how it is made.
I cannot see the safe in question in the op as the ebay number doesn’t work for me, if the single lock throws at least three bolts then it complies. If it has a certificate to say it’s been tested to BS 7558 it complies regardless of having just one lock.
