Disgracefully I've realised I've steered you slightly wrong - the tiny cobbled climb at the end of Whitepost Lane is the bit between Sandrock and Overcliff Road, as circled in the screenshot below.
Disgraceful.
I've now changed the start - a full rep of Greenwich Park hill which must be on the cobbles, with a descent on the single track.
The "Greenwich Park Gutter" is truly one of the great cobbled climbs.
@elswick started
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Disgracefully I've realised I've steered you slightly wrong - the tiny cobbled climb at the end of Whitepost Lane is the bit between Sandrock and Overcliff Road, as circled in the screenshot below.