Yeah, I've not heard anywhere else where not only do you get a clearance expiry time, but there is this thing where you are told to depart 10 min etc behind so and so. Even happens with clearances to Kinabalu and Kuching. Would any ATCO's out there care to explain this system? Can't see that happening at busy airports like LHR where you won't have a clue where this other aircraft is who you're supposed to depart behind of by a certain time limit.
Anyway, there are one or two particular guys that work Lumpur Approach that are really good.