Between the Lines S02E07 - The Fifth Estate

Bosher, an investigative journalist, prints details of a "royal conversation" allegedly from a tape leaked from GCHQ; when the tape is reported missing, Clark investigates whether Special Branch stole it. Angela Berridge, however, says that the tape has never existed, and this is confirmed by her contact at GCHQ. Mo discovers that MI5 have a plant in the newspaper office and persuades him to dig into Bosher's files; it is found that Bosher has fabricated the story and claimed £20,000 to pay for the non-existent tape, which enables Mo to persuade him to print material to discredit the local Chief Constable and assist ACC Jan Lewis' search for social and sexual justice.