Hilly routes near Oxford

I'm moving to Oxford in a couple of months, so I'm after some good routes. Looking at the map, it looks like Brill is the nearest hilly area, but still particularly challenging.
My current staple route is 100km with 2000m of climbing, including a couple of 20% climbs.
Does anyone have any similar, or preferably harder, routes around Oxford?
Cheers
My current staple route is 100km with 2000m of climbing, including a couple of 20% climbs.
Does anyone have any similar, or preferably harder, routes around Oxford?
Cheers
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Brill Hill is ok, but once you've climbed it from all 3 directions, you'll be bored with it.
Go the other way to the Cotswolds and you can rack up some hills as well and as said once you get to the Chilterns you can find some good climbing - Whiteleaf Cross (Princes Risborough) is the only local entry in the '100 Greatest Cycling Climbs' book, but its a fair step from Oxford..