You forgot to mention that the flame was also kept alive by on and off line video pirates. Due to some of the people with copyright interests in the show making a long series of idiotic decisions it was never available in North America. At one point the whole thing was ready to be released and, literally, at the last moment someone decided that the cover art on the box wasn't perfect so the whole project was scuttled. If you wanted to see this great series on this side of the Pond it was dodgy VHS tapes and later the Pirates Bay for you.
A wacky favourite of mine. Partly because of the wobbly sets. In some of the stock footage of the spaceship Liberator docking and so on it has four pylons; in others three because a technician dropped the model part way through the filming. There's also the mystery of the titular "7" as there never quite seemed to be seven members of the rebel group. "Blake" was also elusive as he dropped out of the script at one point for a long while until the great last episode.
But the big draw was Paul Darrow playing the character Avon with all the warmth of a coffin nail. He's the man in the middle in the posting's picture. The character was a big fan favourite and it was a ritual to yell "Ding-dong, Avon calling" at the screen whenever he entered the set by blowing a airlock door off the hinges or some such. In the first episode the political prisoner Blake is on a transport to the Prison Planet along with a bunch of regular criminals. Amongst these is Avon, the second greatest computer hacker in the galaxy - who's just been caught embezzling by the first greatest. When six prisoners escape and find a fabulous, powerful alien artifact Blake wants to start a revolution. Avon will have none of it and wants to use it to hoist the Jolly Roger and be a pirate. This is one of the central points of tension in the first season and an indication of how the scripts avoided falling prey to easy tropes.