That sounds familiar.........Could well be, How on earth do you do an install, in a kitchen of all places, have no Main bonding in place and issue certs....I am far from perfect but come on' that is terrible. The DIY store with the big orange letters should also be held to account, it isn't the first job I've seen either by the same contractor that works for them, the last one I saw also a kitchen, no supplemetary fitted, an unused wall light removed, cable taped up, and I mean just taped up, and covered with a wall unit! To top that they sited the cooker iolator in the center of the hob four feet up the wall! Oh yeah and put a socket either side of the hob again about a couple of inches away from the hob itself....How do they keep getting away with it?