The Viewdata Database is a sub-project of the main "Celebrating the Viewdata Revolution" project, over at www.viewdata.org.uk. This is the first stage of a complete re-write of the entire web project. The main website will be reborn again soon too.
I'm always on the lookout for any surviving data relating to any viewdata and teletext services. If you have anything saved from the distant past, please get in touch! The best thing ever would be full service backup from the host computers, but we love copies from editng systems, dumps taken by users, pages saved to floppy or tape, or even printouts and magazines.
Stock photo there, by the way. I'm none of these people!