....... and thats without considering the method of fire system ( which is woefully inadequate and illegal ) ie mains manual fire system. ..........
Smoke Monkey, According to GregC there is no fire alarm at all.
Anyway, I think the material is probably made from asbestos and the fairy lights are low voltage LED versions with the mains supply to the double insulated low temperature transformer protected by a RCD. Also the walls of the corridor will slide seemlessly underground (allowing direct acces to free) if the fire detection system detects fire(Greg said there was no fire alarm not that there was no fire detection)
Sorry, I take all my above flippant remarks back. It's just that I'm still smarting about the extra work that GregC created for me by coding XP95 call points wrongly back in the year 2000! Bear a grudge? who me?