An early autumn ramble with GOC London around the water park at Rickmansworth, a short ride on the Metropolitan Line out to the north west of London. The venerable Grand Union canal (this section completed 1814), river Colne and some gravel pits are crossed by numerous footpaths which made a pleasant tour amongst the wildlife.
Our lunchtime stop at a pub alongside a canal lock was followed by a small hill up to countryside on the edge of the Chiltern Hills and then back down to Rickmansworth.