As part of its "Afternoon Drama" programme, BBC Radio 4 has broadcast to date twelve series of dramas written by David Ashton and starring Brian Cox as McLevy, Siobhan Redmond as Jean Brash, Michael Perceval-Maxwell as Constable Martin Mulholland and David Ashton as Lieutenant Robert Roach. In the 1999 pilot play, Phyllis Logan played Jean and John Paul Hurley played Mulholland. Lieutenant Roach was not introduced until the actual first episode of Series One; in the pilot play, McLevy's superior was Lieutenant Moxey, with the change in command explained as Moxey having been "elevated" to The Haymarket (in the novel "Shadow of the Serpent", the explanation is that Moxey "had left somewhat under a cloud and Roach had been swiftly drafted in from Haymarket to fill the gap ...").