Spy cops inquiry: what we’ve heard so far

Set to be the most expensive in British history, the decade-long hearings are investigating more than 100 undercover officers

Man silhouette against night city background.
At least 25 undercover police officers formed romantic relationships with unsuspecting women
(Image credit: iiievgeniy / Getty Images)

Mark Jenner, a former undercover Metropolitan Police officer known as Mark Cassidy, has begun giving testimony to the Undercover Policing Inquiry. His appearance follows evidence already given by his ex-wife, the woman he deceived into having a relationship, and the whistleblower Peter Francis.

Jenner is one of 139 undercover police officers being investigated by the inquiry over their infiltration of thousands of predominantly left-wing groups from 1968 until at least 2010.

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Will Barker joined The Week team as a staff writer in 2025, covering UK and global news and politics. He previously worked at the Financial Times and The Sun, contributing to the arts and world news desks, respectively. Before that, he achieved a gold-standard NCTJ Diploma at News Associates in Twickenham, with specialisms in media law and data journalism. While studying for his diploma, he also wrote for the South West Londoner, and channelled his passion for sport by reporting for The Cricket Paper. As an undergraduate of Merton College, University of Oxford, Will read English and French, and he also has an M.Phil in literary translation from Trinity College Dublin.