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I cycled this route in August 2019. I would avoid Maldon which is busy, tourist-ridden and has an 11% hill to exit. Will think about using a route from Tiptree.
This highly enjoyable route through gentle hills, high causeways, valleys, villages and ancient hamlets follows ride 7 and part of ride 8 from Nick Cotton's book 'Chilterns, Hertfordshire & Essex Cycle Tours'. I have made one change and avoided The Causeway and Whitebarns Lane out of Brent Pelham by taking the B1038 which wasn't busy on an Easter Sunday. Leave it in if you like to leaven your ride with some gravelly lanes. I thoroughly recommend this book even if you do need to plot the GPS yourself.
A route from Coppermill Lane through both reservoirs in the Walthamstow Wetlands opened in 2018. The route goes from the Coppermill Lane entrance and crosses Ferry Lane to exit at Lockwood Way. (Be sure to turn left here: don't continue to Blackhorse Rd). It then continues on a cycle path to Highams Hill, crosses Billet Road, comes through Aveling and Lloyd parks to cross Forest Road and enters Hoe Street. Good surface, can be done on any bike.
For me, the simplest and shortest route from this part of Stoke Newington to Upper Walthamstow, East London