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A challenge to find the most street savvy and knowledgeable Londoner. In teams, participants travel across the capital, solving clues to find secret locations in the city (zones 1-2). All transport modes are acceptable. The winner is the team that returns to Regent's Park with the fastest time and photographic evidence of all visited locations. Proceeds go to Build Africa, a UK-based charity working in rural areas of Uganda and Kenya. For registration details see www.ultimatelondoner.co.uk