The Beiderbecke Tapes.

The Beiderbecke Tapes is a two-part 1987 British television comedy-drama serial written by Alan Plater. The second installment in The Beiderbecke Trilogy, it stars James Bolam and Barbara Flynn as schoolteachers Trevor Chaplin and Jill Swinburne. When a tape recording of a conversation about nuclear waste inadvertently falls into Chaplin's hands, he and Swinburne find themselves being pursued by national security agents.