benhaha85.
My sister, that's who!
Which reminds me I've still got a couple of new smoke alarms to put up, I bought 8 (a mix of ionising and optical) to replace the existing ones when I realised that the old ones were 10+ years old (tested regularly, but I'd forgotten when they were bought and they didn't have any easily visible markings).
I'm putting them in every bedroom, the halls, and the dining room, hence 8, but still have 3 to fit as I'm decorating one room (very slowly) and haven't had the time to do the other two.
Possibly excessive but I'd rather be overly cautious especially when it only costs a few pounds a year.