CO alarms - they are NOT the same as smoke alarms!

I have met more than one doctor who was under the impression that CO alarms and smoke alarms were one and the same thing. They are not!
A smoke alarm costs around a fiver, and lets you know if there is particulate smoke around. A CO alarm costs around £40 for a decent one. The best have 'real-time' digital displays and will record peak levels.
You can get CO alarms at all major DIY stores, and also through the Tesco website.
There are cheaper ones around that simply change colour in the presence of CO, but would you want to trust one of these if you were asleep or semi-conscious??