'There's no comfort, no blow-up beds or anything - you're just in a tent and you fire up a little Primus (camping stove) to cook your food, and again you have to do that a long way from the tent in case the bear smells the food... We go as often as we can.'

'It's entirely normal, the most unglamourous thing you can do. Everybody stinks, and you're cold and you're wet and yet you see things you'd never see from a car or a hotel room. You walk every day and you're away from everything. Some people in this business go, 'I can't go anywhere without the paparazzi', but if you really want to you can find a way to go and be private,' he added.