Was asked to do a wall by a friend , it's his dad's and he has had a kitchen fitted. The sparky has fitted the cooker and put bonding on the wall . I didn't ask the question but why would a sparky need to do that? It's a mess and I told him I would need to hack it back in places and put a tight coat of bonding to give a flat substrate to work off,I also think the two small units will be better coming off and refitted after the wall is skimmed.