Abs: FWIW, I have just returned from a "seniors" rerun of the C&M Hilly 50 k: 50 miles door to door, 3400ft of vertical with 5 significant climbs including Whitedown Lane, ave speed 12mph. Yr route is I assume flatter/faster. So,100m at 14 mph seems doable given the terrain as I understand it. Having said that 100m is beyond my current experience and so that may be a wild extrapolation. I know I will have to feed as we go along.
What vertical do you estimate?
Geoff, with the way you zoomed along up and down the hills on the ride to Whittering ride last year I have no doubt that you will be fine on this one.