Redvip2000 : You forgot a big important factor. A lot of armament was sold and used, pockets were lined and wallets got fat. The goal of the war was achieved.
In Civilization: The Six Killer Apps of Western Power, London (2012), Niall Ferguson reports (p.309) that
By the end of World War II Britain had amassed an immense debt of £21 billion. Much of this was held in foreign hands, with around £3.4 billion being owed overseas (mainly to creditors in the United States), a sum which represented around one third of annual GDP.
On 31 December 2006, Britain made a final payment of about £45.5m
and thereby discharged the last of its World War II war loans from the US.