Without the work at Bletchley Park, the war might have ended very differently….
That's right. Those people literally saved the world as we know it. I believe there was a joke that if U-Boat Commanders wanted to know what their orders were, they could find out faster by calling Bletchley Park than than waiting on their chain of command.
The allies would still have won thanks to superior numbers and resources, it just would have taken a bit longer.