I know this has been posted previously, but that was over 3 months ago.
The deal is still on, with free delivery and free mask, goggles and gloves.
Site has a calculator to work out how much you need and what it will cost.
100mm or 170mm available, both £3 a roll
Just added 170mm to my loft 45sq/m for £36
You dont need to be an npower customer to qualify for this deal.