Fire Angel HT-630 Heat alarm at only £6.06.
It has a 10 year battery and detects heat rather than smoke.
I'm going to add it to my Fire Angel Smoke Alarms that I have installed.
This is over £22 on Amazon and over £17.99 at Screwfix.
Free Reserve and collect from your local branch.
Voting HOT does seem a bit ironic on a heat alarm! :)
There is also a good deal on the SI-601 and the SO-601 Smoke alarms here:http://www.hotukdeals.com/deals/fire-angel-smoke-alarm-si-601-plumbworld-5-76-2590147
20% discount for your 1st order !