you are in the EU – no working visas for the UK.
biggest prob I had when moving to the UK was opening a bank account and re-registering my car.
Last conf I was at in Oxford I flew Aer Lingus to Birmingham and got a Virgin Train down.
Stuff from conf website
Arrival by air
All four major London airports (Gatwick, Heathrow, Luton and Stanstead) are conveniently accessible from Oxford, with Heathrow and Gatwick proving to be the most popular and convenient ones. Birmingham International Airport provides another alternative. An excellent bus service is available from Gatwick and Heathrow direct to Oxford. See http://www.oxfordbus.co.uk/
There are regular 24 hour coach services between London and Oxford and both Heathrow and Gatwick airports. They run approximately every 20 minutes during the day and the journey is about 90 minutes. For more information visit The Oxford Tube (http://www.oxfordtube.com/) and Oxford Bus Company sites( http://www.oxfordbus.co.uk/).