Watched the first episode of the (26) episode UFO (1970) TV series on YouTube. Interesting how much it felt like a warm-up for Space:1999 which aired five years later. 
UFO Episode Guides 
UFO
UFO
Here are some links to the series in case anyone wants to take a stroll down memory lane (or is in the mood for some deliciously cheesy 70's sci-fi)... 
UFO (Full Episode) - 01 Identified
UFO (Full Episode) - 01 Identified 
UFO (Full Episode) - 02 Computer Affair
UFO (Full Episode) - 03 Flight Path
Not that I need more video to consume, but I should check this out. I seem to remember liking Space 1999 way back when 
Tanarian
says
I think fanon is that they were in the same 'verse.
I must have missed that entirely. I spent those years as gummint property
only vaguely remembered UFO
Tanarian: Interesting and it makes sense too.
A wee bit too early for me.