The Diary has heard many a fireside tale about death-defying City types crossing the Andes with nothing more than a turbo-charged 4×4 with satellite navigation, or boldly giving the butler the day off to run the London marathon.

One genuine iron man of the law is London maritime lawyer and extreme sports legend Lewis Gordon Pugh, whose nickname of ‘the Ice Bear’ hardly does justice to the frankly insane feats of aquatic endurance which he calls a hobby, including sub-zero swims in glacial lakes wearing nothing more than his trusty Speedos.