This was first a one-off Afternoon Play in 2001; it was then repeated as the first episode of the first series in 2003 and called Doctor Joe Aston Investigates.
For the BBC7 broadcasts it was renamed as Introductory Episode
The other three episodes in the first series had the blurb: "Three new cases for psychologist Joe Aston as he continues his work with the police in Teeside."
Can't See For Looking and Taken By Surprise were repeated as part of Radio 4's The Memory Experience Season.
BBC7 announcers have claimed this was commissioned for that station rather than Radio4.