I work some of the time in Guildford, and took advantage of needing to be offsite for some of today to take a peek at some of the Surrey section on four wheels. Paging
@rvw, here's srw's guide to (some of) the hilly bits.
Ripley to Horsley is mostly a long draggy slight uphill - the steepest bit until you get to the houses in Horsley is the A3 road bridge. Usefully there's a newsagent in Horsley for a Mars Bar hit (if 17,000 riders haven't cleaned them out first). In the middle of the village the road starts ramping up more steeply, and that ramp continues once you turn onto the A246. At the top of the ramp the road starts rolling, with some decent downhills to get the momentum up.
You then turn left to start climbing up the A25 towards Newlands Corner and an official hub. That's probably a middle-ring hill, with only one short moderately steep section. Just as you think you've got to the top there's another little ramp to catch out the unwary. Then there's the fastest mile or two of the ride - a smooth, wide piece of road going downhill steeply enough to get up speed quickly but not so steep as to need too much braking. At the bottom the road splits into a dual carriageway, so some care will be needed.
The next section of the A25 is flat. Then you turn right onto the B2126 at Abinger Hammer. This is a
long section of road, even in a car. It's a fairly rough, draggy uphill for several miles, going up a valley. Once you get to Holmbury St Mary there's a fairly short steeper section taking you up out of the village before you reach the top and there's a straightish (but narrow and bumpy) downhill.
Then comes Leith Hill. It starts with a fairly gentle section before getting steeper - but with gentler, almost flat sections. Once you get past Leith Hill Place (large brick wall, which seems to be a water stop) the hill gets more serious - but it looks like a straightforward bottom gear spin. There are a few wiggles, and you'll know you've got to the top when you pass the footpath signpost to the tower on the right hand side of the road.
Leith Hill down is long and will be quite fast - but it's narrow (single-track at times), dark (wooded) and there are a few bends, and I'm pretty sure i spotted a pothole on the outside of a sharp right-hander (marked with a chevron road-sign) which could be awkward. There is, unfortunately, a little rise just before you get back to the A25.
If I get around to it I'll pop over to Box Hill one evening.