Has anyone had wall insulation done? Any idea how much you save?

[cat811]

We live in an end-of-terrace townhouse - front and back walls aren't suitable (or most of them aren't anyway) as they are tiled, but the side is - we were told it would be free, but the guy who came round said that only a certain amount of m squared is free, and you pay on top of that. So ours is just over the limit, and they can do it but for £80.
Just wondered if anyone has any vague idea if/how much we are likely to save in the long run heating-wise? Do you think it's worth forking £80 now? Could it make that much difference really? We don't know what to do! 380 is do-able now at a push, but only really if we can justify it in bills (and without having to wait too long to see the difference)
We couldn't ask the guy who quoted us as we had to rush out so he posted quote though the door - dh asked when he rang up, but the lady only dealt with bookings and had no idea...
Thanks :)

[vodkaanddietirnbru]

I'd get another quote tbh. British gas are doing free cavity wall insulation and loft insulation for everyone

[vodkaanddietirnbru]

www.britishgas.co.uk/products-and-services/energy-saving/home-insulation/free-insulation.html

[cat811]

Have just checked the British gas one....the terms and conditions say that there are charges unless you have a minimum of 2/3 of the walls done, which we wouldn't be. I can't work out why they charge if you have LESS done though - doesn't make sense