The back wall where the fireplace is now being lined and insulated.  Honestly, this room is going to be so heat-efficient by the time we’ve finished with it!  There’s special fireproof plasterboard going in next to the fire, so we can get a fire fitted there at some point in the future if we choose.  I really don’t want to do work now and have to re-do it all over again in a few years time.