Timeline
Key dates in the inquiry's progress, assembled from its recorded milestones and hearing phases.
Hearing-phase dates are taken from the published hearing days; some earlier milestone dates are approximate where the inquiry has not published an exact date.
Milestones & hearing phases
Milestone
Hearing phase
Reports & costs
Still to come
Inquiry Announced
Home Secretary Theresa May announced a public inquiry into undercover policing.
Evidential hearings
192 sitting days
Reported costs: £144.6m
Inquiry-published total expenditure to end June 2026; not final costs
Final report (to be confirmed)
The inquiry has not yet reported.