[Neil Jones]

There's loads of conflicting and misleading info about missing TV shows these days anyway. Doubly so with it often getting conflated with "lost media" which much of the time isn't lost, just unavailable, I've seen a fair few things over the last few years on lost media lists due to not being publicly available being declared as "wiped" in some places even though they aren't.

LostMediaWiki is good at this.
Their definition of "lost" starts and stops at "I can't find it on YouTube, therefore it's missing".

I think it was Kaleidoscope who had an online portal that told you what was missing and what wasn't, though it went out of date and probably hasn't had the love or attention devoted to it probably should have. The other main resource was the late Mark Brown's site and forum, which was taken over by the community after he died. occasionally something interesting pops up on there.