I don't know how you guys stop yourself from going mad with these COC's. I generally never do COC's on things I haven't wired myself, ie for when someone is selling there house. I have to do one for a gooood customer (consistent industrial/commercial work) on there house. Seriously, who put 78 down lights on one circuit. There is no space in the board and 3 under floor heating circuits are put in one breaker. Its all earthed and ins res is good but as soon as the next person moves in and puts all the lights on or puts the under floor heating on - pop goes the breaker and ring ring goes my phone. Last domestic coc i swear, day 4 i'm going back again to see what else is wrong.