A first time poster here - but a regular reader!
I let two houses through an agency on a fully managed basis. I haven't set foot in one of them in six years as I have been living at the other end of the country until recently. I thought that it would be a good idea to fit some new smoke detectors and a carbon monoxide detector (the house uses warm air heating in addition to a gas cooker)
After some research I went for these. Two smoke and one CO. Total cost £54 at the time.
I went over and installed them today. A big advantage of these smoke detectors is that they have a sealed battery which will last a long time (until 2019 I believe). I think I'll go for wired ones once these expire.
Best not ever take a risk with fire or carbon monoxide.
Cheers for now.