Also I have heard the four-part series called 'Paul Merton's Silent Clowns', that started May 25th, is 'really good'. If available, watch BBC Four for the next program in the series.
Buster Keaton started the series on May 25th, and can be seen again May 28th. Check the BBC Four website for schedule. (Charlie Chaplin is scheduled for June 1st and will be repeat on June 4th.)