Today's 'Saturday Play' was 'The Tinner's Corpse' by Bernard Knight. This is the fifth novel in his 12th Century Crowner John series. (A review of the tenth, 'Elixir of Death', will be going up on Euro Crime in the next couple of weeks.)
'The Tinner's Corpse' has been condensed to an hour and you can listen to it via the Radio 4 website for the next seven days.
It seems that Bernard Knight's homepage has disappeared but Wikipedia (as ever) can help. Knight is also one of The Medieval Murderers - which comprises Mike Jecks, Susanna Gregory, Bernard Knight, Ian Morson, Philip Gooden, and Chris Sansom - whose third collaboration will be published in April.
Addendum: Here's Bernard Knight's new homepage. (With thanks to It's a Crime!)