Frankly it amazes me that so few people bother to get their facts right when making films.
Dave, I agree, however, film making is, generally, a for profit endeavor. Historical accuracy seems to take a very distant place to the producers' desire to put butts in the seats to watch said film. If Tom Cruise playing Gibson in a B-17 and Morgan Freeman as Barnes-Wallis will draw a bigger box office, it's naive to think they won't do it.
For a-rgh, et al, I had posted, then deleted this, but since you insist:
Ya know, you can make such a film in a British studio. Just as you can send your two carriers and their air wings down south again if needed.
In both cases, oh, right, sorry...............................................