Prepping: 'How I would survive an apocalypse'
Michael Sanderson - known to most as Roach - is a "prepper". These are people that prepare for catastrophic events such as the end of the world.
Roach is an ex-military man who spent most of his working life in the armed forces as a paramedic.
In the forests of Hertfordshire, he teaches the Victoria Derbyshire programme's Benjamin Zand his survival skills.
Watch Benjamin Zand's full film about British preppers on the Victoria Derbyshire programme website.