Denise: After a very long wait, our house here at An Gàrradh Mòr now has cavity wall insulation.  That’s largely thanks to a Scottish Government energy conservation grant scheme, leaving us to pay just less than £200.  How much difference it will make is difficult to say. J says that because we can’t afford to heat the house properly anyway, the rooms we do heat (with thermostatic control) could cost a bit less, and the cold damp corners of the house might not be quite so cold and damp! But energy is so expensive here (we spend more than £2000pa and are scarcely any warmer for it, other than in the kitchen with the Aga), and when it is windy in winter the house loses so much heat, that we will surely get the £200 back in the first winter alone. But winters are so variable that we’ll probably never be able to tell for sure.