The Colne starts life at Colney bHeath/b in Hertfordshire?s Chiltern Hills and eventually discharges into the Thames near Heathrow Airport in the London Borough of Hillingdon, some 30 miles south-west of its source. b.../b But in this case it?s taken from the main Colne plus the rivers Gade and Chess which converge at bBatchworth/b, between Watford and Rickmansworth. The Grand Union Canal also cuts through the valley here. And within the Aquadrome country park where our foursome b.../b
