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James is right - we need 20 to 40km, and it makes sense to use it to get a nicer route.
(The current route is 340km in g-maps walking mode with only 4 controls including the start and finish control.)
But we can easily gain some further north on nice roads just before Peterborough and/or flat miles near Leeds. So there's no need to gain loads of km exiting London unless it improves the route in some way.
Congratulations!
It was the section out of London to Weathampstead.
We need to add a little bit of distance so zig-zagging to stay on nice roads is fine, provided we can easily control at the end of each zig or zag. (ATMs are ideal - if we can ride up to them then it'll only take 2 minutes to get proof of passage and move on).
If you've got some route ideas on how to go north I can search for ATMs and check on rule compliance.
https://ridewithgps.com/routes/28903881