Ok guys I am blind. It's an RCD box and the fuse has B40 on it which i'm guessing is 40amp. It's an upstairs ensuite and the cable comes down from the ceiling so again i'm just guessing that it is under the loft insulation. The insulation around the cables is just the standard grey as far as I can tell. We have a triton T70i in the main bathroom which has the same fuse B40, can anyone tell me what kw that is.