Carbon Monoxide alarms, so so SO important as it is the unseen killer.
A lot of these alarms have an expiry date as they loose their efficiency to detect the smell and people aren’t aware of it so please do check yours. Mine actually expired in September 2017 and has obviously been replaced now. I bought two whilst I was at it. One which is near my boiler in the kitchen and one in my living room where I have a gas fire.
Go on, check yours now! 😷