I have one area which is quite large in total, covered by a fairly big double vertical radiator, i was hoping once i'd finished and everything was fully insulated and sealed up, it would be up the job of heating the whole space, but I think the kitchen lets it down (furthest away from the rad), which is dot and dab (which i've tried to foam behind, but still get air leakage, probably due to thermalite blocks shrinking), and poorly fitting spot lights (which is on my to-do list), with 4 double gl