I wonder if anyone can throw some light on something that is bothering me. I have a small under stairs cupboard which houses the fuse box and other switches and boxes. There is a hole in the back of the cupboard through which come some wires from an extension I think that was done in the kitchen area. I presume this hole leads into the cavity wall? There is a smell coming from this cupboard which doesn't seem to be strong enough for other people to comment on but I am sensitive to smells and smell it very strongly. It is like a very dirty smell. I think I can also smell it upstairs in the bathroom and again, there is a gap under the sink that may lead out into the wall space. I had a friend who is in the building trade to have a look and he couldn't smell anything(always the way) but said there was absolutely no sign of damp and that it was probably just a cupboard with no air smell. I cleared out the cupboard of all the stuff and wiped it over and put in an air freshener, but still I can smell it really strongly. It isn't an electrical smell I don't think, it just smells dirty. Does anyone have any ideas, could it be coming from the cavity wall and if so what can I do? It doesn't smell like anything rotting either i.e. a dead rodent or anything like that. Also, if I wanted to investigate who would be the best type of trades person to ask? Thanks.