I agree, but in this case we're not talking about reasonable false positives (e.g. toast burning or candles being blown out). I wouldn't put up with a £10 smoke

I agree, but in this case we're not talking about reasonable false positives (e.g. toast burning or candles being blown out). I wouldn't put up with a £10 smoke detector waking me up in the middle of the night for no discernible reason, much less one I paid £89 + shipping for.