Clearly the full title of this series of blogs is just clickbait now. That said, I haven’t seen any of this fondly remembered show, which is something I should probably remedy forthwith.
Whodunnit? was created by Jeremy Lloyd (yes, that one) and Lance Percival (yes, that one) for Thames, and ran for 48 episodes over six series from 1972 to 1978. Initially it was hosted by Edward Woodward, but from series two on, Jon Pertwee took over that role.
I like that later series took place in the crime scenes. These shows are all available on DVD.