So what were the questions that they had to to answer? Do you want a house that is more comfortable, which has lower running costs and is kinder to the planet? And by the way, do you want this to be something which everyone across the country could have without having to put their hand in their pocket for cash? A pleasant proposition and one which WWF supporter Rebecca Williams was happy to say yes to in agreeing to let the Great British Refurb campaign team do an energy makeover on her house.

While progress is being made across the country in topping up loft insulation and filling cavity walls, her Victorian mid-terrace in inner city Manchester is typical of one of the 8 million UK homes that simply have no cavities to fill. And it's one of the 9 million with a suspended wooden floor lacking insulation. Without getting too techy, this makes them a little bit trickier to deal with, and on occasion a lot more expensive to fix (as explained in the solid wall insulation blog).