i will let you as soon as mate,but the cost will be cheap as im getting the alarm of a guy that does jobs for me dad, and ill be fitting it for myself. if i wanted to get the alarm guy that does jobs for me dad,the system and labour would cost about £175. i will let you no the make and details once i get it.
as smoke detectors go, i am doing a 230v supply plus heat and c02 detectors for the kitchen. i dont mess about.lol