If you don't already have a carbon monoxide alarm in your house then this is a really good price for one, and it's a small price to pay for the peace of mind it will give you. The Kidde Carbon Monoxide Alarm is reduced down to £12.99 at Amazon for today only, and it qualifies for free delivery as well.
This carbon monoxide alarm provides continuous monitoring, and will sound an alarm if the gas is detected. If has a digital display, and a ten year warranty as well as a warning when it is time to replace the unit. It works on ordinary AA batteries, and there are two included.
The reviews are really good, and as it's going to last for 10 years, £1.30 per year for something that can detect a deadly gas that can leak from your appliances seems like good value to me. I wish we had got ours at this price!
Thanks to logindetails @ HUKD