The moment a kayaker risks his life by plunging 120ft down a waterfall

Fancy a gentle paddle down the Thames? Or a splash about in the Norfolk Broads? Or maybe something a bit more bracing?

Like a 120ft vertical drop, straight down the front of a churning, thundering, pounding waterfall into a jagged mess of rocks, froth and vegetation, with just a fibreglass kayak and a jaunty coloured helmet for protection?

Perhaps not. Extreme kayaking may not be everyone's cup of tea but, extraordinarily, it is becoming more and more popular as adrenalin junkies further their quest for a high-octane thrill.