Yup - it goes back up at 30% on the other side!!!
And just in case, here's the StreetView link. My suspicion is that this is a "cycle route" because they consider it to be too steep to be a "scenic drive" route!
After that the ride up across Widemouth Bay and down into Bude was relatively easy!
Specs: 21 miles, 620m/2030ft of climb, 7.9mph average speed.