Ex-paratrooper Christian Lewis had hit rock bottom, suffering with depression so severe he would shut himself in his bedroom for weeks. Then while surfing – his only respite – he cast his eyes along the coastline and realized it was the only place he really wanted to be. Making an impulsive decision to set himself a challenge – walk the entire coastline of the UK – Chris gave himself a few days to rustle up a tent and walking boots, then left for good with just a tenner in his pocket and two days’ worth of food.