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It's perfectly fine but not part of the route I take.
I normally go Tower Bridge, Springfield Park (either via Bethnal Green -> Homerton -> Towpath or straight up Kingsland Road), Walthamstow then a nice off-road route into the forest from there.
Edit: It's been a while since I've taken that nice off-road route so it may well be a bit of an overly-scenic route... Unless @Dom or @spotter are coming and meet us at Springfield Park
Looks like Ponders End is the next best option
Overground: New Cross Gate to Shoreditch High Street
Head to Liverpool Street - 9:30am train to get to Ponders End for 10 and then a short pootle to Chingford.
Will we die on the Lea Valley Road on the way there? Narrow, little overtaking space and lots of suburbanites...