Draw a perfect circle on a map of London.
Walk a route that follows the circle as closely as possible.
We meet in the middle of Tower Bridge, on the east (downstream) side of the road. Please arrive by 9.45am so that we can begin punctually! We cannot wait for stragglers!
This is a challenging whole-day adventure, as the route is over 20 miles. Remember to bring appropriate footwear and waterproofs, and provisions to keep you going. We will stop for lunch somewhere in Kensington.