Is mounting a new dist board on its back allowed these days, as per pic below (apologies for my disgraceful phone camera) I have been asked to change it for an RCD/MCB split board by a mate, Ideally id like to just swap it over in the same position, but ive got a feeling you more experienced and more importantly, more QUALIFIED chaps will know better than i do. ALready spotted the M/C cutout which i will get the DNO to change and whilst there at it Ill be getting them to install an Isolator.