Having promised at 12.30 to be with me "in a couple of hours" your sub-contractor arrive at 6.30pm in the middle of supper. In the event, the problem was electrical, and nothing to do with the extractor hood. The engineer could use a little training in customer relations, and was rather brusque and overbearing. It's not my fault that he had had a bad day. (However, his first language was not English so this might have been part of the problem.) My views are probably coloured by the fact that I had to pay £80 for nothing except for the diagnosis that I needed an electrician!