Thanks Mick.  I'm at the Sheraton, as it seemed to be close to Terminal 5 where the Aberdeen flight lands.  Didn't know about the freeflow bus zone,so I'll have to look into that.  Don't know yet what Aberdeen flight I'm on - I've asked for a late flight, so just realised I probably won't be able to meet you guys for a meal.  Once I get the flight confirmation, I'll let you know.  Appreciate your help.