The story of 16 men put on trial for sadomasochism in the dying days of Margaret Thatcher’s Britain was told by the police, the prosecution and the tabloid press – but not by those in the dock. Returning to court documentaries and newspaper reports of the time, the film Lasting Marks is a window into Operation Spanner and a fight for LGBTQ rights that resonates to this day.

This is director Charlie Lyne’s second documentary for the Guardian, following on from Fish Story.

Lasting Marks is released in partnership with Field of Vision and Just So.

Coming up: Anonymous Comes to Town

How hackers tackled high-school sexual assault in a sleepy rustbelt town in Ohio.

• Anonymous Comes to Town is out on 18 April