Did it go up Row Down? (Brutal 1km (ish)) climb that's near shoreham (on the end of pilgrims way?) I was out with a couple of mates, and we rode up there to be greeted by a photographer have way up...
I think it was the middle section from penshurst to Ashdown forest into that head wind that did me. Trained on most of the hills but still a challenge for this early in the season.
Did an extended version of the route today! And, yip - row dow ruined me as I was 120 clicks in by that point! Lovely route though - will defo do it again in the summer with some mates rather than solo like today..