Yes Marc, but in that case UK and France could just as well accepted the proposal from the Sovjet Foreign minister Litvinov and marched into Germany in 1933 to arrest Hitler. After all, Hitler did threat to attack USSR in his book Mein Kampf, so nobody could say they didn’t know. It looks like the capitalist Brits hated the commies so much, they wanted Germany to grow strong and kill the commies. So no, I don’t think the Brits or the French would have done anything to prevent the war from starting. It had to be prevented by someone else, like the Terminator coming to 1936 by accident, and mistaking Hitler for John Connor