Only go to Oxford/Cambridge if a) you are a post grad and have international rowing experience, and therefore are likely to have a crack at the blue boats or b) you are fairly crap and happy to spend 3 years in your college 8 - fun but slow.
Outside of Oxbridge, Oxford Brookes and Durham are excellent. Then come places like Reading, Bristol, Newcastle, University of London, Imperial College.
Then Birmingham, Lougborough, that sort of place.
Most unis have a rowing club, but that doesn't mean you want to go there!