What are all the containers for near Longcross M3?

[rek]

I was in the Back of a cab and managed to have a proper gawp at what looks like a arena or stadium built out of shipping containers next to the M3, about 1-2 miles from M25.

Just curious as to what it's for..

[rek]

I never realised there was a studio there.. Just googled longcross and movies and all sorts of things have been made there.