I would like to take the oppertunity to recomend to all the importance of carbon monoxide detectors last night my wife an self where woken by our alarm the fire brigade where called out as I took my wife to A&E . BIG PROBLEM the ordinary smoke detectors as fitted in most houses do not detect carbon monoxide ,but for us having a dedicated unit the fire service said not ony us but our neighbour would have been dead.We were lucky a -we had one b -it was an electronic unit not an expensive one either redily available from tesco,currys etc. The fire officer said that alot of people have the card type that changes coulor when gas presant NO GOOD we were in bed but for the audible alarm we would not have woken so I recommend to one and all buy one .A few hours on o2 in hospital thank fully every one seems to be ok .On a lighter note please ignore the spelling my head is still confuddled wether its the gas or just me I'll have to wait out