Karl Pilkington travels the world in search of answers to some of life's most important questions. He begins with marriage, wondering whether he is wrong about not wanting to tie the knot with his long-term girlfriend. In Delhi, he gains an insight into arranged marriages by going on a date with a prospective wife - and her parents - and in Bangalore, he is asked to help a pair of elite wedding planners. He also sniffs out a scientific approach to finding the perfect partner in LA, before searching for an alternative way of getting hitched in Las Vegas.

• Karl Pilkington
• John Montgomery