It's never too early to start thinking about the shape of the next war, even if the current one is still being fought. At the end of May 1945 -- only three weeks after V-E day and over two months before V-J day -- some discussion on the subject was held in the House of Lords by interested peers. On 29 May, Lord Vansittart proposed an international commission of scientists to monitor Germany to make sure it did not develop or use 'any scientific discovery or invention considered dangerous to the safety of mankind'.1
He said we were dealing with a periodically homicidal nation, and unless we kept a firm hand on them we should have V10 in less than 10 years. There had been an insufficient answer to V 1, and no answer at all to V 2 except the old-fashioned one of conquering the sites. Science had not given the answer. The second world war had been within measuring distance of the atom bomb. Where would the third begin? We had had the very devil of a lesson, and it would be our own fault if we had another.2
He also called for something like 'a world inspectorate in order to guard against the development or over-development of secret devices',3 which could lead to 'a secret armaments race of a far more terrifying character' than any that had gone before.
Vansittart was clearly disturbed by the effects of the German V1 and V2 missiles on London. At this time, London was (along with Antwerp) the only great city in the world with experience of missile warfare -- the last one had fallen in March 1945. V2s in particular were very unsettling, as no defences and no warnings were then possible for objects travelling on a ballistic trajectory four times faster than the speed of sound.