We also use a B&Q CO detector. Even had it go off once at very low CO level so nice to know it works and is VERY loud. Fortunately wasn't a structural exhaust problem, but a particular vicious sideslip to the right whilst "keeping it tight" to beat the incoming queue of CAT and avoid 20mins in the hold. Must have been just a tiny amount of exhaust gas gone in through the right-hand wing vent. A chemical detector wouldn't even have registered it.
Last edited by Shunter; 7th Jan 2013 at 05:25.