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@Mr_Smyth
i just looked up mine, most recent one has expired, the first one was a C, the most recent one a D but it says 'single glazing' which is wrong as it had crappy wood frames with very narrow double glazing.
both say roof insulation 100mm but they were obviously too lazy to look into the dormers, something tells me they don't pay attention when doing them.
Would probably be a C now (triple glazing, roof insulation, properly insulated HW direct fill cylinder and Lot20 compliant heating)