Thanks guys - for some strange reason fuel capacity and refueling procedures have fascinated me ever since I laid eyes on an FGR2s drop tanks during a tour of Coningsby back in the late 70s. I never did find out where that missile I fired in the simulator went, and we were royally told off for sneaking into an EW Canberra that was undergoing repair after a wheels up landing - presumably on grass as the damage didn't seem too bad.
The RAF were gracious and generous hosts but we were served the most god awful fish and chips I have ever had.
Now if someone can tell me why high density fuel never caught on......