ShinyandNew - When you have been through what we have, believe me you would put a smoke alarm in every room except the kitchen. The fire in house house last year started in the loft, which was the room above the kitchen, dh and 3 of my dcs were in the kitchen, and 6 metres of the roof was already open and ablaze! He was unaware until he went upstairs and came across the scene from backdraft.
Thankfully dh was there, and was able to save the dcs, the dogs and the rabbits, but the fire took the whole of upstairs, via the roof, the 50cm oak beams were burnt through completely the bedrooms were all turned to ash, all clothes beds, all toys etc. The bath and toilet completely evaporated, and we lost all the furniture downstairs too.
No smoke alarms were upstairs, and if we or the kids had been asleep, we wouldnt have made it. We had 37 fireman who could not contain the fire, and there one one fireman who said in 17 years he had never seen a fire like it.
Please do not think it can never happen to you, because it does happen, and smoke alarms are put in every hotel room and b&b room for a reason! One smoke alarm is not enough!