Already posted four months ago, but a good reminder as it finishes in a month:
If your home isn’t properly insulated, British Gas (even if you're not one of its customers) is once again installing free loft and cavity wall insulation in suitable homes (not N Ireland). All-in this can be worth £700, according to the Energy Saving Trust. Until recently, only those on certain benefits could get this.
£50 Compliments Card valid at John Lewis, Argos, Toys-R-Us and more.
If you qualify for the free insulation, you can apply either by filling out the callback on the MSE site, or by calling 0800 294 9126 (or 0330 100 3640 for the mobile friendly version).