BBC Radio Four Extra have recently aired a number of radio plays of some of Terry Pratchett’s novels.
I don’t know how accessible these are for the non-UK Dopers but so far there has been
Wyrd Sisters - (4 episodes)
Guards, Guards - (6 episodes)
Small Gods - (4 episodes)
and currently up to the third 30 minute episode of Night Watch(5 episodes)
Apparently there was also Mort (4 episodes) but I missed that one…
I don’t say that they are brilliant but, being Pratchett, they are very entertaining.
Maybe they will make them available on CD.