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Ride to Denmark Hill, take the overground to Dalston, ride 5 mins to Hackney Downs, get train to Chingford, ride 15 mins to Loughton. You can take a bike on all of that without reservations.
Edit - the line to Chingford doesn't re-open until 10:15 Sunday because of works. It's only a 20-minute journey, though, but might make it a bit tight - looks like the first train into Chingford arrives 10:49.
I think getting people to at least consider what they'll do if they need to bail out isn't a bad thing. I presume people with no plan at all are more likely to create extra trouble for organisers.
At the moment though, I'm more concerned with how to get to rhe start for 11am start time from Brixton. I really don't want to ride. Has anyone worked out a good driving route to the start from South London taking into account all the ride london road closures? As far as I can see crossing at Dartford might be only option. Or there's public transport, but i don't want to get turned away due to having a bike at the last minute.