Free loft insulation UK

We contacted our energy supplier (npower) to see if we were eligible for free loft insulation, after a few weeks and a free home energy survey which rates your windows,doors,cavity wall insulation, loft insulation and boiler we then got the call to say we were indeed eligible for the scheme I shopped around and calculated that it would cost us over £500 to buy the amount needed to cover the whole loft area for a total insulation depth of 270mm
The fitting took about 3 hours and was carried out by a contractor for npower