Nurses, trains and tunnels
My school wasn't involved in the Doomsday project, so I didn't get to see the BBC and Laser Disc player until they started turning up second hand years later.
However, I first used a Laser Disc player in a university project back in the late 80s to create an interactive training system for nurses. The idea was they would answer on screen questions, and be shown video clips of the right and wrong way to do things, such transferring a patient from a stretcher or how to make hospital corners on a bed.
We had a lovely system to develop on, it had a full 768x576 PAL resolution video overlay with 4MB of video memory, 24bit colour and 8bit alpha channel transparency (compared the 4 colour CGA graphics of a typical PC at the time). The laser disc of video clips hadn't been shot at that point, and the only disc we had was of the history of steam trains. The video was fantastic quality I got a bit board after a while of the endless clips of trains going in and out of tunnels that we used to test the system!