Couple of good ones on the BBC iplayer,
How the North West Was Won
The history of the North West 200 motorcycle race from its beginnings in the 1920s to the present day, told using a wealth of archive pictures and film.
Full Throttle: The Glory Days of British Motorbikes
Documentary which explores the British love of fast, daring and sometimes reckless motorbike riding during a period when home-grown machines were the envy of the world.