The route, a top rope problem, is graded British 7a (approximately Font 7C+).
Due to the soft nature of the rock lead climbing is not permitted, meaning all routes must be top roped or soloed.
Climbing at High Rocks involves an entrance fee and the crag is an SSSI. Access details are in the UKC Logbooks.
Jon's ascent was captured on film by Nick Brown of Outcrop Films and is shown below.
Crosstown Traffic, 7b
Chimaera, English 7a or Font 7c+
Summer is Champion by Laura Veirs
July by Natty
Jon Partridge is a member of the British Bouldering Team and is sponsored by Beyond Hope - the UK distributors of Evolv, prAna and Metolius.
You can keep up to date with the sponsered climbers from Beyond Hope on their blog: climbersblogs.blogspot
Thanks to Nick for this video - check out Outcrop films - they have a new UK Bouldering film coming out this year.
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