Well, the Home Secretary would probably be forced to announce an inquiry, which might report over a decade later, long after said Home Secretary's political career was over.
« In 2012 Theresa May had commissioned Mark Ellison QC to review allegations of corruption »
« The Undercover Policing Inquiry or Pitchford Inquiry … is due to report back in 2023 »
Consider for example https://en.wikipedia.org/wiki/Undercover_Policing_Inquiry
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