I don't know about LAS but up here in South Yorkshire they don't seem to update their maps that often. I live 100 yards as the crow flies from the nearest Ambo station but as the estate is newish (we've been here for about 3 years) it doesn't seem to show up on the maps. Whenever I've called for the ambo, after speaking to control I get a phone call asking for directions. That said the last call resulted in a RRU (with a very grumpy driver) in about 2 minutes and a van in 2 and a half (with a paramedic who chatted about this blog). Pretty good service really. Cheers Mark