Yes, your energy provider will actually give you, for free, either loft or cavity wall insulation! What's the catch? Well - it depends how old you are, what sort of house you live in and who your provider is.
British Gas and EDF customers can get either insulation free - whatever their age. There are a few conditions (like not having a huge 5-bedroomed house) but it just seems to involve making an appointment for a free survey and then if all is in order they will book a date for the work to be done. Other providers do give free insulation to customers over 70 years of age - check your provider's website or give them a ring to find out.
British Gas say on their website, that it could save you between £135 and £175 per year. Worthwhile looking into!
A game I want to win
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