The Brecon Beacons is the chosen testing ground for one of the most revered fighting forces in the world – the Special Air Service.

A deceptive and gruelling environment, the deadly extent of its pitfalls was brought into sharp and shocking focus on Saturday 13 July, 2013.

Early morning, three supremely fit, experienced soldiers set off on a 16-mile timed march.

It was a relatively short exercise in a series they had volunteered to undertake in a quest to being accepted into “The Regiment”.