Chimney balloons

Wow - where did February go?
The latest item to assist with energy efficiency is a chimney balloon. I got mine from http://www.chimney-balloon.co.uk. The chimney balloon looks like the inside of a winebox, with the nozzle in the centre. You put it up the chimney and then inflate it. It blocks the chimney, and stops the warm air you've paid for - well, going up the chimney.
If you aren't sure you need one, try putting your hand near the chimney and feel the air moving.
The cost is between £20 and £25. I strongly recommend buying the hose (another £2.50) which attaches to the nozzle and stops you having to put your head up the chimney.
It was easy to install (less than a minute), and takes about the same to remove if you want a real fire. It also comes with a warning label, which is red and says 'Remember to remove the chimney balloon'. the only thing I'd ask the makers to add is a string which allows you to attach this small label to the balloon itself; if you leave it on the mantelpiece, you might forget.