In response to 'Get your home insulated for FREE with British Gas (if you claim benefits) !'
I took advantage of this deal and was told by a BG representative that 'Mark Group' would visit my property to conduct a survey. Visited their website out of curiousity and it seems you do not need to go through your energy provider to access such offers.
Have a look. Prices seem to range from £149 - £169 if you have to pay.