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If you really want to go mad, I have a 100+ mile ride based off this route, with over 1700m of climbing (probably closer to 2000m). The route then dips down past Horsham (good place for lunch) to join the Downs link and manages to follow it uphill (which is a challenge as it's an old railway line), then comes up and over Leith Hill (off road), crosses the ford at Shere twice (because why not?) and then creeps up and over Epsom downs before joining the river for the run to home. That's a full day of pain and suffering.
You could also go south on the Downs link to Shoreham for a day by the Seaside as well for a much less challenging ride.
Alex_B-
That first one you mention sounds really lovely! Haha not sure I would say that after doing it mind you. Sounds vaguely similar to what I have planned for this Saturday for my solstice century. Though I let Komoot do most of the planning based off of a downs link ride to Brighton I found and edited to loop back to London round Horsham.
Qebrus
Well if this is anything to go by, we are nearing 10 people interested already just off of this post.
I’m sure there is plenty more like us who was a more adventure/exploring focused rides as opposed to like you said “sportives”
With a little asking around once we get it all planned out we could bring more people to the rsf due to having more accessible rides from London, even as far as ride or so each month even!