Animated by rainwater from the roof at Neal's Yard, the water clock is the work of Tim Hunkin and Andy Plant and celebrated its 30th anniversary last year.
BST ends at 2:00pm: Put your clocks back by one hour!
A London Walk costs £9 – £7 concession. To join a London Walk, simply meet your guide at the designated tube station at the appointed time. Details of all London Walks can be found at www.walks.com.


