What I would like to know is:
Who will play the brilliant American inventor who said to Barnes Wallis about how to design the bouncing bomb?
Who will play the handsome American pilot who actually leads the mission but whose existence has to be kept secret because America is not in the war yet?
Who will play the beautiful American spy who finds out something critical to the mission, like where the dams are; and then falls in love with the handsome American pilot before tragically dying as they drop the first bomb?
Who will play the daring American general who actually conceived the whole plan but needed to use England as a base because Flying Fortresses did not have the range from the US? (You didn't know the aircraft were really Flying Fortresses, did you?
)
You will need all these people if the film is to sell in the US. As it is, expect Hank Lincoln to eclipse Guy Gibson in all of the important scenes....