I saw Unx's safe seemingly dumped in the garden and asked if he was chucking it out. "Yes it won't open" was Unx's reply. It seems one of the cats had pissed on the lock and jammed it. Always up for a challenge I set to with blow torch, pliers, and WD40... ignoring Unx's "I tried all that".
Of course safe cracking is dead easy when you have the combination and the key.