IF I REMEMBER FROM READING THE REGS ( I MAY BE WRONG) that the cert is needed if the safe is anything less than the minimum of steel (6mm) ... such as the bisalloy I mentioned , because the safe was only 4,5mm it needed a cert to confirm it meet the same strength/toughness as 6mm steel (not sure if mild or cold rolled) ... but as I have seen by reading a lot of the forums here that there is a national policy that doesn't seem to happen in all places as in some AOs will ask some will not etc etc ....
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