So................. the local locksmith came and sorted the door. He asked me to show him the advert in Yellow Pages, which had a local number attached. He does contract work for them, so we may have gotten the same man anyway. The "local number" goes through to a call centre in Englandshire.
The difference is that the local man charged £160. The other guys would have billed me for over £400, and he would have got, yes, £160 for doing the job.
You couldn't make it up!