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Since 2010, this social enterprise has given homeless people the chance to lead tours - of Brick Lane, Brixton, Camden, Covent Garden, Shoreditch and London Bridge - giving other Londoners the insight into their city that only sleeping rough can give you.
More than 6,000 people have taken the opportunity, shown around by 16 homeless and formerly homeless guides - among them, Henri, Viv and Hazel remain from the very first tours. The guides take 60% of the ticket price, with 40% going into the running costs of the not-for-profit organisation.
Note: to celebrate its fifth anniversary, Unseen Tours is offering a two-for-one deal - book a ticket and you can bring a friend to your tour for free.