I think I know what Southbound was alluding to.
Was it not argued that FS
TA could be used for commercial transport operations and only called in, and role fitted, for AAR should the need arise.
The need was to sustain Typhoon caps in the North Sea.
I am sure BEagle will be able to refresh our memory.
This entry is interesting as well:
http://en.wikipedia.org/wiki/Future_...anker_Aircraft