I bought an AEG oven, that came with free installation. This was to replace an old oven that was on its last legs. They turned up and came in. The "electrician" then turned the power off, unscrewed and removed oven, connected test probes to cable, ran test, tripped box 4 times, said RCD was faulty and to get an electrician to look at it. I asked if he could do it, he said no and that was that, so i arranged an electrician, He came out, ran a test and said there was nothing faulty, and that the AO guy probably had it on wrong settings. So pretty shabby from that point of view, and to think they charge £90 normally for it, money for nothing, and a pretty blase attitude. Thankfully, i have another oven, fully installed by an electrician who actually seemed to know what they were doing.