These debts accrued from the lend-lease scheme, where any equipment loaned to Britain and that stayed here after the war had to be paid for. In addition teh US loaned theUK 2.2bn, and Canada loaned 607m, just after the war, at favourable interest rates of 2% pa. Total sums repoaid are 3.8bn and 1bn.
I wonder to what extent these loans are offset by rent on US bases in Britain during and since teh war? How much did we charge for passing on radar, jet engine and nuclear technology in WW2?
I look forward to receiving setttement of our invoice for assistance in the Iraq adventure.