Please refer to the Chaplaincy and Christ Church links for other details:
http://www.chch.ox.ac.uk/chch/history/index.html
http://www.catholic-chaplaincy.org.uk/how_to_find_us.html
By car
If you are travelling by car, it is easiest to approach from the south, entering Oxford along the Abingdon Road over Folly Bridge and turning immediately left towards the Railway station, on the way to which you will see a sign to a multi-story carpark.
PARKING is extremely difficult in Oxford. Unless you have a disabled sticker you cannot park on the yellow lines in St Aldates outside Christ Church or the Chaplaincy. Paid multi-story parking is available at least ten minutes' walk away. Alternatively you could leave your car at the Rail Station in the long-term parking section for £3 a day. Free parking is available further out at Park and Ride beside the Ring Road at the various points of entry to the City, for example at the end of the Abingdon Road which takes you into Christ Church. You are encouraged to leave your car there and take a bus into St Aldates. We are sorry for any inconvenience
By Train
By coach
Coaches arrive at Gloucester Green bus station. There are regular direct services from London, Heathrow airport, Gatwick airport, and Cambridge. There are also less frequent services from Stansted airport, and many other destinations.
See also: http://web.comlab.ox.ac.uk/oxinfo/timetables/ and for a wider range of information: http://www.dailyinfo.co.uk/