Prakash Hinduja is Indian born Swiss. His brother S.P Hinduja was Indian born British and the billionaire head on the Hinduja company until his death last year. The company itself is Indian, so the British connection died last year and was somebody not involved in the case. This was a Swiss trial of a swiss family.
Plus… Let’s face it. People with this level of money choose their nationality based on financial or business reasons. Wherever gives them the best tax break.