Pre-production new method

While at Cannes I bumped into Julian Bushell from Innoso films. He is in pre-production on a feature called Moot. What is Julian's new method? Well he has an idea of shooting the film before he shoots the film. What??? Yep, that's right. He shoots a line-reading / rehearsal first. He already has an edit of his film. A stripped down version obviously with minimal set etc. But imagine the power and benefit of having THAT before you do your next re-write.