Depends what budget you are looking at but I had a fantastic wedding on a budget in Oxford, a lot of this was to do with the fact that I had it out of season (early March) and so all venues were available. It also depends what kind of ceremony and day you would like. This is what I had, if you want more info on anything (bridal shops, flowers, etc) then let me know.
I married at a small village Church where my family are from, although I didn't / don't live there so had to stay there for 2-3 weeks while the Banns were being read. If you look at "Church Times" on the link it shows you the Church.
http://www.kbsonline.org.uk/
We went to Hawkwell House hotel for the wedding breakfast, who were very good value (an initial look might make you think it is expensive, but in comparison to the other places round here it's excellent and not as pricey as you might think). The food was fantastic, the staff were wonderful, everything was just magical. I can't remember the name of the room we had but it is the part-conservatory one. Some of the other rooms I found to be a bit too dim, the restaraunt was light and beautiful. The location is just fab and so pretty, I can't say anymore about this place - just go have a look!
http://www.hawkwellhouse.co.uk/