This is not a military inquiry, it is a coroners' inquest. These are held in the UK in the event of a death with unusual circumstances. I believe it is mandatory if the death occured overseas. The bodies of British service personnel are always returned through RAF Brize Norton in Oxfordshire, this has led to a backlog of cases hence the four year delay.
The purpose of the inquest is to establish how, when and where a person died. At the end of an inquest the coroner may make recommendations which could include starting criminal proceedings.
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