All the episodes were 100 minutes long, shown as two 50-minute parts on consecutive weeks.
Both Peter Davison (Albert Campion) and Andrew Burt (Inspector Stanislaus Oates) had both previously appeared in the BBC's Miss Marple series - Davison in A Pocketful of Rye (1985), Burt in 4:50 from Paddington (1987) - both of them, interestingly, playing murderers