I wasn’t going to do a Blake’s 7 episode when I conceived my podcast Very British Futures. I felt that show already had several excellent podcasts covering it and my series was about the less celebrated UK shows. In time however, I found that listeners want to hear about the shows they had watched, as well as ones they’d never heard of, and besides which, Blake’s 7 has got so much in it to enjoy and discuss.

For such a significant episode I needed first rate guests and I was fortunate that my...