Further adventures of my cold new house - new thread to deal with problem of cold ground floor as suggested by @PigletJohn
It's a 3 bed semi, all.laminate, two fireplaces downstairs not in use, dining room was extended in the 80s and has a big patio door and windows for almost all of the back wall.
The floor is cold to walk on and I don't think the radiator in the dining room is big enough.
Front room is the warmest room in the house, only one to get 20 degrees and hold heat if you keep the door shut. Curtains aren't even brilliant in that room.
Sorting front door is probably first on list.