Its a good film, and everyone should see it.
But its not the same as Spitfire.
Its less about Lancasters, and more about bombing missions and the politics behind it all.
Bombers did a lot of damage and killed a lot of people, civilians included (casualties of a German war),
and while Churchill directed their missions, he quickly distanced himself from Bomber Command after the war.
It took decades for Bomber crews to be recognized and supported for their contribution.
And to finally get a Memorial.
Thats what this movie is about.