[Mike]

Sorry for my ignorance here, but how easy would it be to connect this up to a domestic TV or monitor in, say, my front room, and have a nice BBC One clock on display?

You're assuming it still works. There's a rather spicy looking battery on one of the boards and I imagine it may need some level of re-capping.

www.bbceng.info 

This document sort of gives a clue, you need a receiver for MSF data that can interface with the MSF in or some form of reference for it to use for timekeeping in the absence of that, not sure if the mains supply would be readily available then you'd need something that could take the 3 BNC connectors of the output into a modern input connector or an old school BNC monitor?

I've no idea if Richard Russell is still around or on here, but he would probably be the best person to get it working again.

What is fascinating is how the background can be obtained through connecting a slide file or quantel device to the input