Ripped all the living room carpet and underlay up now. Underlay was pretty damp but the floorboards underneath are fine. Pretty sure the damp was just tracking across the underlay rather than coming from beneath it. Again, probably wouldn't be happening if there was some heating!
Plumber came out to quote for installing new radiators. Unfortunately one can't be lead off the rad in the hallway as the pipes aren't sufficient (apparently). So this means new ones have to be plumbed in from upstairs. Sounds like a much bigger job than I was expecting... Gonna have to put new pipes in under the floor in one bedroom and the box room (as in the one I've just decorated
) to get to the end walls and pipe down to the lounge. Grim. Waiting for the quote to come through but already informed the family not to expect Christmas presents this year