When Rajini Vaidyanathan was offered an opportunity to work at the BBC’s Mumbai office as a correspondent for six months, she was thrilled. “That was 18 months ago,” says the 33 year-old, who was born and raised in Milton Keynes, a new town about an hour away from London. “My job is fascinating and it’s amazing to be in India at a time of so much change.”

Vaidyanathan found she wasn’t the only such expat. “I met a lot of people, who, like me, had moved here reversing the journeys their parents made decades ago. I realised this was a growing trend. In 2010, nearly 30,000 people left the UK for India. And since 2005, 1.1 million Overseas Citizen of India (OCI) cards have been issued.”