Between 1995 and 2002 four recruits – the so-called ‘Deepcut Four’ – were found shot dead in separate incidents at the former Army training camp in Surrey. Sean Benton, 20; Cheryl James, 18; Geoff Gray, 17, and James Collinson, also 17, were all on guard duty at the time of their deaths. In each case, the army concluded that the young soldiers had taken their own lives.

It was a conclusion that their grieving families could never accept…