So finally had as built epc done on Flat roofed 125M2 masonry bungalow. U-values roof .10, floor .10, walls .13, windows and doors average at .9. Airtightness 0.8ach. Gas Combi but its used 170Kw during 23days of november for heating at 18c with no one living in house. I thought I had done pretty well on a tight budget. EPC is B -85 what the !!! no suggested possible improvement apart from 2.5Kw solar.
So EPC not really worth the paper when you consider my current 20year old barn conversion got b -81