Possibly useful for my future reference, once I get around to finishing my stop-start Doctor Who re-watch, is the 1990 MacFarland book A history and critical analysis of Blake’s 7, the 1978-1981 British television space adventure. Newly found on Archive.org, to borrow. It appears to have just about everything you might want to know about the much-loved Blake’s 7 TV series, including episode synopses.
I also spotted the more fannish guide-book Maximum power! : the complete unauthorised guide to all 64 episodes of Blake’s 7 (2nd edition). Which has details of some of the more obscure spin-off items…
Warning of wobbly cardboard stage-sets and rubber-suit monsters: 1970s British sci-fi TV series are not for everyone, and are something of an acquired taste.