Chambers is about 10 minutes walk from the station. If you prefer, there is a taxi rank situated at the station.
Much of Oxford is pedestrianised and there is very little parking in the city centre. The closest multi-storey car park to Chambers is behind the Westgate (shopping) Centre. However this is often very busy. Oxford has an excellent park and ride system with four car parks situated to the north, south, east and west on the ring road.