"Loft insulation acts as a blanket, trapping rising heat from the house below. Without it, you could be losing as much as 15%* of your heating costs through your roof. If you currently have no insulation and install the recommended depth (270mm) you could save around ?150* a year on your heating bills! Or if you already have some insulation, why not top it up to 270mm and feel even more warm and toasty?"
Amazing deal! I ordered enough to cover the whole loft in my house and it came out at ?22 which is ridiculous. Free delivery, mask and gloves included.
http://www.npower.com/web/diyloftinsulation/index.htm