Resurrecting this thread as have been approached before by a company which was engaged in a scam as described.

However, have just booked loft insulation install at zero cost (to us) with Saving Energy Ltd who are being funded by various councils including Lewisham. The only requirement was that the existing insulation is less than 60mm.

Hurry, scheme finishes soon:
http://www.lewisham.gov.uk/news/Pages/Fr...looms.aspx