I've been avoiding hills for a while now - no real reason, but I'm commuting a lot at the minute, so I've been avoiding the tougher rides just for an easier life. With that (and the tour of Britain) in mind, I went out two weekends ago and rode up Haytor just to see what the pro's would be doing. It hurt, and I needed to bring out the granny (on a triple!) to get to the top, but I made it without stopping and with a smile on my face.
Last night, I decided to ride the tougher (but shorter) route home from work - a hilly ride over Haldon from Clapham (near Exeter). It's a stone-cold cow of a climb. According to BikeHike it's only 2.6km from start to finish, but it kicks about a third of the way up and then it kicks again shortly after that, for nearly 200m of climbing in that distance. I've still not managed to conquer it in a single sitting (though a couple of pints at lunchtime probably didn't help), and I've no idea on how it compares to "proper" hills, but it certainly hurts me. Assuming bikehike is accurate, then it's up at nearly 17% at it's steepest.