This is a handy little gizmo for tracking flight departures and arrivals:
Click Here: Flight Stats
There are three tabs on the top. For flight arrivals/departures at Bangkok, select the third one: By Airport. Type in the airport code BKK selecting the appropriate field for arrivals info or departures info. Select a departure date as well if required and hit Go. You’ll get the latest info. Very handy.
If there's sufficient demand, perhaps it could be added to the Thailand-UK front page?