There are numerous trains from either Marylebone or Paddington to Oxford costing £5.50
The trains back run at 22.30 22.41 and 23.09 all cost £5.50
The above prices are without the need to have a railcard.
Unfortunately coming back is an absolute nightmare as you will have to allow at least one hour to get back to the station, such is the bad service with the buses outside the ground(which is about 4 miles from the station)
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