In reply to adam 24:
Brookes is decent - basically very busy and not much space, so difficulty often increased by putting holds further apart or just making them tinier/more horrible, so not the breadth of routes/problems you'd get elsewhere. But it does make you feel really hardcore when you go elsewhere! Good club scene with university and the town. Good bigger walls within an hour ie Milton Keynes, Reading.
Sadly Oxford is also not particularly convenient for outside, though has the advantage that if you're prepared to drive 2-3 hours in any direction (or Symonds Yat closest at 1:30) you have pick of South coast, Peak, Wye, Bristol so can go with the weather forecast.
Summertown is good - I've been living and working here for years. Most people live in Kidlington because it's cheaper and commute in to the ringroad, so if you were going the other way you would be going against the flow or traffic hopefully!