Tune in to BBC radio 4 at 8pm this evening for File on 4, which examines the cases of eight women currently suing the Metropolitan Police and/or the Association of Chief Police Officers.
All eight had sexual relationships with men who were undercover police officers, infiltrating radical political movements. The length of time covered by these cases - 1987-2010 - perhaps indicates the scale of the manipulation. A BBC taster for the programme can be read here.
If you miss the show tonight, it can be caught again on the Radio 4 website, and is repeated at 5pm on Sunday 7 October.