I say to give the world the 9 existing episodes of Unsung Heroes. Other UK TV things "out there" which are in dire need of a decent non-ebay rip-off release are the 1997/1999 Big Breakfast Interviews and the 1997/1999 BBC Omnibus shows, George Lucas - Flying Solo and the Star Wars Story.
Other candidates could be the Sci-Fi Channel show, The Force Returns from back in 1997 or the pre-Star Wars documentary, George Lucas - Maker of Films....