Thank you both. Hi Brum,I already have three smoke alarms,it was your Brigade that shamed me into buying one.by the advert you put on the T,V."dont let it be your fault for not fitting one" . What Id like to know is if a c,o meter was fitted,and it showed up or went off that it was dangerous. What would one do then,and who would you call. If the gas board were called would they actually respond.or send someone not Qualified.?