Henkeman said:
OK, ta. That's unfortunate, it makes explaining so much of it impossible.
Truthfully it makes it explaining it difficult. In reality, the story World at War presents is still perfectly reasonable. That was the invisible hand of Ultra you see. We used it well, very very well, camouflaged it magnificently and always made sure it looked like we'd found out information another way. I can remember in the Kursk episode though that it was revealed that the Soviets knew a lot of detail about the attack was coming. It left it there though so little bits were known of how much was known were revealed but just not where they come from. It's hard to place yourselves in the shoes of a historian in 1972 but I'm guessing that might be something the Soviets had leaked out themselves, as though it was their own intelligence, Even though the western allies eventually handed the information to them, they already knew themselves as they had spies in Bletchley feeding them everything. However, even though that was the case, the Soviets always made sure to play along with the ruse by sending out snatch squads and the like to capture Germans and the advanced knowledge look like it came from regular sources. They surely knew the value of protecting Ultra as much as we did,