The title of the world’s most travelled person is subject to much debate and competition. There is a list of those who claim to have seen every single country on the planet (and then some, when you take into account territorial quirks), and a website dedicated to documenting who has been where and whether they can prove it.

Holidays these are not.

But amid all the clamour, there is only one person who holds the Guiness World Record for being the youngest person to travel to every sovereign country in the world, before the age of 25.

James Asquith, born and raised in Hertfordshire, is now 30 and has used his experience to launched travel app Holiday Swap, which allows people to exchange their...