Harrow - 481 km

We enter into the London Borough of Harrow, home to a very famous school, educating both royalty and Prime Ministers. Harrow was also home to one half of the famous operatic duo W.S.Gilbert, from Gilbert and Sullivan.

Harrow has a diverse population when it comes to faith, with over 80 places of worship, representing religions from Jain to Buddhism. One of these religions is Zoroastrianism. You might not have heard of it, but you'll be aware of one of its British followers: Freddie Mercury. It's one of the oldest monotheistic religions in the world, originating in 1,500 BC in ancient Iran.

When Zoroastrians fled Iran for India, they were not allowed into the country unless they promised not to convert anyone. This has become a rule of the religion, leading to its followers dwindling in number. 2011 census data shows that there are only 4,100 Zoroastrians left in the UK. Their main place of worship is the Zoroastrian centre on Rayners Lane, a grade II listed converted cinema.