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Actually it has just occurred to me, I have sold my other house, and there i have had a new kitchen 18 months afo, with a built in oven and hob and a cooker hood, and also a large corner power shower and huge heated towel rail in the bathroom, the plumber that fitted the shower did the electrics on it and the towel tail, the joiner that did the kitchen put the cooker and hob and oven in (though actually he may have brought a spark one day) , I have sold my house and had to do one of those new packs, but noone has asked for any certificate, and there isnlt one for any of it either. The estate agent has never mentioned anything and the sale completed fine!