What was your initial approach?SARAH GREENWOOD:Its history we know quite well.
A lot of gaps had already been filled in, but this film is about capturing themood.
Theres also the counterpoint to the downfall: the look of something like Valkyrie.

Sarah Greenwood/Focus Features
[Churchill was] in a war room in a basement…
The Downing Street set is actually a derelict estate.
It doesnt look like Downing Street, but it has thefeelingof Downing Street.

Sarah Greenwood/Focus Features
We did the same thing with the war room.
We took that inspiration and created our war room on a set of two stages.
You never knew quite where you were.

Sarah Greenwood/Focus Features
The same goes for Buckingham Palace.
All the plasterwork was there, but again, it felt like it hadnt been touched for 70 years.
Were not a documentary: were telling our story with our atmosphere and our feelings for the subject!

Sarah Greenwood/Focus Features
Were the politics and the intimate detail [to their action]… but we cant compete!
Though we did use the same five boats thatDunkirkused.
Ill tell you why.

Sarah Greenwood/Focus Features
Theres a little boats association [in the U.K.], and they literally have the boats from Dunkirk.
Thats such a nice bond the two films share.Totally, and this is my whole thing: I loveDunkirk.
Its amazing, and were the bookend.

Sarah Greenwood/Focus Features
I think the two should be seen together, particularly for kids in education.
Theres an amazing togetherness, really.
In years to come, it will be a great thing to see them together.

Sarah Greenwood/Focus Features
I also love how intricately character develops through Katie Spencers set decoration.
Our cigars were the same cigars Churchill actually smoked.
Darkest Houris in theaters now.

Sarah Greenwood/Focus Features