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It looks like the route has changed since I last looked at it - that looks quite good!
Same as when I did it in 2019, it was good!
Thinking about it again this year actually, if there are any "on-here" who'd like a group
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I always confuse Upper Thames (2015, 2016) with South Bucks Winter Warmer (2016, 2017) but I still reckon you're maybe thinking of Chiltern Grit.
I uploaded my first one from 2015: https://www.strava.com/activities/6195843262
Have you mixed it up with a different event?
https://lister4cycling.webador.co.uk/the-route