Good advice from Sam above. The old Oxon club that you may find references to closed a few years ago, Oxford city (I am assuming sept uni start ?) is in the middle of the
mid-south brca area, you may need transport.
Map of 10th Mid South
There is
High Wycombe that run 1/18th and others, or you can easy make Hillingdon or Milton Kevnes in just over an hour on a good day if you want TC. There is 10th off road in Watford with DMS and at Taplow near Heathrow.