Originally Posted by
bealine
Dialling 999 or 911 and requesting "Ambulance" would get you through. As soon as they established your location, the Airport Paramedics (who are employed by London Ambulance Service) would be deployed straight away and back up requested.
You forgot 112
Thanks for posting this. Even c-w-s learned something new and he's probably in LHR more than some staff. In my case it's made me realise that if I hear any unusual noises I should look around see if any alarm lights are flashing.
You've also identified a need where extra training is needed for airport staff. If I'd noticed an alarm going off I would have thought pointing it out to a HAL staff member would have been sufficient, but sounds like not all of them would know what to do.