The rudimentary elevation chart on MapMyRide suggests the little hill on the current route is at 7% for 200m anti-clockwise, and would average 4% for about a km clockwise (incidentally only maxing out at 5%, despite looking steeper).
The turn off onto that crest maxes out at 20%, and the whole climb is ~500m. 1eme Categorie by Norfolk standards.
Yeah, as Jules says, Gas Hill averages at 19%, peaks at 21% for a couple of metres according to MMR. Only 250m long though, so just under half the length of the Ringland one!
The rudimentary elevation chart on MapMyRide suggests the little hill on the current route is at 7% for 200m anti-clockwise, and would average 4% for about a km clockwise (incidentally only maxing out at 5%, despite looking steeper).
The turn off onto that crest maxes out at 20%, and the whole climb is ~500m. 1eme Categorie by Norfolk standards.