I was speaking to a fireman this week. We were discussing his upcoming rewire and I was explaining what would be different from his existing three-fuse installation and why. He laughed when I mentioned new controls coming in (Part P and all that... ) because he said that when they investigate a fire, if there is no obvious cause the easiest thing is to put it down to an electrical fault. (In much the same way that speeding is blamed for every other road accident because sheer stupidity is too hard to prove!)