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It was another mysterious Russian death on British soil.

One afternoon in November 2012, the businessman Alexander Perepilichnyy went out for a jog and never came back.

He was later found dead outside his mansion in Surrey. Mr Perepilichnyy was about to give evidence in a huge fraud case linked to Russian organised crime.

Nearly six years on, as the inquest into his death is set to draw to a close, this programme has now learned that the government will be able to keep some key details secret – including whether the businessman ever had links to the British security services.

Jim Reed has the background to this extraordinary case.