the warmth of your house is determined by the room thermostat temperature setting ( this is usually installed in the coldest room/place ) next by how long you have the central heating set on for.
turn your room thermostat up to 20 degrees mark.
make inquiries
see if you can get free or a grant for wall insulation or loft insulation they reckon you need a minimum of 12" insulation up there now
wirecutterman
January 2010