This is of course great news for all Doctor Who fans and Douglas Adams fans alike. BBC video has just released a great DVD boxset. It contains the legendary and unfinished "Shada" story never fully completed. You'll find all the existing footage + some Tom Baker narration to fill the missing gaps.
The boxset contains also the BBC produced documentary "More than thirty years in the Tardis" (1993), a famous documentary about the first thirty years of Doctor Who directed by Kevin Davies (who also directed the also famous "The Hitchhiker's guide to the galaxy" TV series making of).
A must have !!