Board Thread:The Reference Desk/@comment-24162342-20131112232506/@comment-88790-20131223071441

Check out the Shada (TV story) and Shada (TV story) sections of the article for more info.

But in short Shada is a Doctor Who story that has had quite a few iterations of it (there's the unfinished story, a webcast, an audio and a novelisation). There was a video release of it in the 90s, it combined the studio and location recordings that were made along with narration done by Tom Baker at the Museum of the Moving Image.

I'm not sure why the station would have these Shada tapes as they it would never have been completed for broadcast (and therefore never have left the BBC Television Centre).