Harry Dunn: Why did the High Court rule the suspect had diplomatic immunity?

Floral tributes on the B4031 outside RAF Croughton, in Northamptonshire, where Harry Dunn, 19, died when his motorbike was involved in a head-on collision in August.
Floral tributes on the B4031 outside RAF Croughton, in Northamptonshire, where Harry Dunn, 19, died when his motorbike was involved in a head-on collision in August.