I was unable to open an old and very heavy safe. C H Wood were the only company willing to tackle the job. They came out promptly and several drill bits later the engineer had managed to drill through the hardened steel shell and with something akin to keyhole surgery he managed to release the mechanism. I was only interested in getting access to the safe contents and wasn't too concerned with keeping the safe intact. However, I was told a new lock can be fitted and the safe reused. Reasonable price considering the work involved.