Widger,
Just venting my frustration at the system - I know that the civilian side will win eventually and there will be more transits to far-flung corners of the the North Sea and more detachments to Goose Bay etc - but even that 'vast' area is at the whim of the North Atlantic traffic.
We've taken this slightly off topic - TCAS does it need a mod? No, it is a great system in the right airspace.
As for CWS on a 4-ship of GR4s at low level - that's another question!
SG