Answer: Grand Union Canal. A towpath tractor is towing the loaded mud hopper upstream from Clitheroe’s Lock No. 99, the first lock after leaving Brentford. Bill Greenhalgh photo 4154 taken on 10th April 1975.
Correctly answered by: David Dumbelton, David Mack, Duncan Wiggins, George Bungle Eycott, Howard Anguish, Ian Cleathero, James Bell, John A Oliver, John Dodwell, John Healey, John Yates, Keith Barber, Malcolm Smith, Mark Rudall, Martin Hunt, Peter Chappell, Peter Oates, Robin Pyott, Rupert Smedley, Simon Judge, Sue O'Hare, Tony Clayton, Vernon Draper.
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