In reply to Ridge:
I wanted to have cavity wall insulation installed last year. What a faff. I have a big open fire in the kitchen (ideal for dealing with children- therre's even a huge oven on the side, and of course the fire makes the Best Toast In The World {TM}) , and a little gas fake one in the sitting room. The vents etc would have actually made the house colder, so I had to abandon the whole idea. The installers kept trying to persuade me otherwise, no doubt worried at the loss of the sale, but I pointed out that I already had plenty of ventilation, thank you, it's called a back door, and NO WAY was I going to have inch-wide holes drilled through my kitchen/sitting room door, and bloody great holes punched through every outside wall.
It has all come about because people really don't have sense to ensure they thay do have sufficient ventilation- with open fires, having a roomful of smoke is a bit of an obvious sign, but for those running gas fires there is a bit of a point.
So, no insulation. Arse.
Sxx