One of the most intriguing of Coward's films is The Astonished Heart based upon his one act play. It was filmed with Michael Redgrave in the leading part and then after it was completed, it was re-shot with Coward taking on the central role. I've always wondered if the Redgrave version exists anywhere. It's a rarely seen film and very brittle in a siff upper lip sort of way - but still it's Coward and Celia Johnson and very worthwhile.