In a revealing feature-length 'Imagine' documentary (around 100 minutes long), Mike Leigh, director of Secrets & Lies, Vera Drake and Abigail's Party among many others, talks to Alan Yentob about a unique body of work and a lifelong struggle to make films on his own terms. 

On day one of a Mike Leigh film, there is no script, no story and the actors do not know if they will even be in the final film. It is a process that has yielded some of cinema's most celebrated performances, and Leigh's new film Mr Turner is already winning critical acclaim.