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You can always shorten the route on the fly and cut away ~20km from Epping Green to Newgate Street towards the end if you guys are tired/bored/late/can't be arsed, it's good stuff tho.
Also, this weeks seems to be hot and you don't really cross many resupply points on this route, so make sure to refill on water when/where you can, next option might be 2/3h later.
giofox-
If I'm going to ride across norf London I'd rather just do it and not cut any of the good stuff out. I'm thinking of taking Wed or Thu off this week and doing it. I've ridden to Walthamstow a few times but don't remember how so I've just used RWGPS to drag a route out and back, it's about 212km all up at the moment. I'm used to dehydration so this will be fun watching the missus shrivel up and beg for water. ;)
hippy
West. Just tweaked it with start/finish and it's ~220k all up.