Peter recommended Drama out of a Crisis: A Celebration of Play for Today to me on Sunday. I will try and catch it on the BBC iPlayer. He said he had almost forgotten how left wing the Play for Today strand was, and then segued into telling me that back in the day, suspected subversives at the BBC had "Christmas trees" on their personnel files.
I thought quite frankly that he had gone of his chump, but no:
The vetting files:
For decades the BBC denied that job applicants were subject to political vetting by MI5. But in fact vetting began in the early days of the BBC and continued until the 1990s. Paul Reynolds, the first journalist to see all the BBC's vetting files, tells the story of the long relationship between the corporation and the Security Service.