When St Pancras International was evacuated towards the end of last year as a result of a Stage 2 fire alarm ('This is an emergency, leave the station immediately' rather than the Stage 1 Inspector Sands), the whole station was empty in under 10 minutes - people start moving as soon as they see that staff are evacuating, and its a concerted effort from the Shift Station Manager and the Customer Service Assistants to reinforce the message to MOPs who might quite understand what they need to do...