I watched the first two seasons. Downloaded it from a British torrent site I belong to. I’ve got the third and final season, but haven’t watched it yet. I like Toby Jones and Mackenzie Crook. Rachael Stirling has starred in The Bletchley Circle, and in the new series: The Bletchley Circle: San Francisco that recently aired on British TV.
Haven’t seen Bletchley Circle - will have to take a look.