An update on this. I have received the following e-mail from the bandmaster regarding the Grangemouth Cadets' tartan which was in fact Murray of Atholl.

Hi, Neil Clark here.

I was googling our cadet pipe band, and saw you had posted a link in a forum, saying you had seen us on the BBC after the Poland Project back in June this year.
If you or the other forum users are interested, we are
1333 (Grangemouth) Sqdn ATC, based in Grangemouth, the tartan was in fact Murray of Atholl, no one, unfortunately was wearing RAF tartan, the sole reason being its too expensive for us, as we are self funding.
However, I've been tasked with establishing the Scotland and Northern Ireland Region ATC Pipe Band, and 25 cadets will be wearing RAF tartan. This should be up and running after May this year.
The history project is ongoing at the squadron, many nationalities are involved, in fact we hope to be visiting Washington in 2009.
I run another pipe band, the Glasgow and lanarkshire army cadet force, and my day job consists in part of playing with Strathclyde police pipe band, where I'm lucky enough to be helped with time for all these cadet bands.
Piping in the Air Training Corps has had a chequered history, and we are now attempting to set things right. I work very closely with the Army cadets, in particular Captain Jim Stout, oic cadet piping and drumming, who is a great help.

Hope this is of some use to you and your fellow forum members, who knows, we may see u next year.

Neil Clark