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BlakeG
Turn at 19.5km to go is sketchy AF - that's the one out of Cucumber Lane that @fredtc and @BlakeG mentioned I think. The bigger roads are actually pretty good - been resurfaced in the last couple of years I think.
Need to keep it under 130% FTP on the climbs and above 85% on the flat. Very useful to recce, even just to understand power a bit.