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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.
So review the whole route or between certain Km’s?
Roughly how much are we looking to gain?