An electrician has installed a spur fuse(?) as part of a bathroom under floor heating installation. They removed a redundant plug socket just outside the bathroom and re-used it to instal the spur fuse. Several days later I noticed it wasn’t straight so thought I’ll straighten it when I come to paint the wall and need to remove it. Having done that I’ve now noticed that the original metal box is too shallow and I cannot screw the cover back on. The fuse unit would never fit in a box that shallow, I realised they actually filled round the edge, probably because there was a gap. Also there are no rubber grommets on the cut outs where the cables come in. I’m wary of trying to force the cover on in case the wires are cut by the box cut outs and the box becomes live. Does the use of an incorrectly sized box and the lack of rubber grommets mean the work is non compliant? Many thanks in advance.