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I only ride offroad and mostly North/North-East of London, so feel free to grab any routes from my RWGPS, most of them from the past 3y should be offroad focused - generally 50% or less tarmac, a few have already been linked above (the Big Summer Gravel one @exteroceptive shares some bits with the Sacombe gravel @hippy shared)
EDIT: The Big Summer Gravel is absolutely ace at this time of the year
Thanks for those who've added routes...I've added a couple more to my own list above.