just an update on my app, i sent it in in dec following advice from this forum to send it in asap, and just let me referees get on with their part of it. i had the D.Phil interview last week and am still waiting to hear back. The surrounding area was really nice, and the new building was stunning; but i think having visited and had the interview, i realised i wasn't as passionate about the subject as i thought i would be (in comparrison to the other candidates i met on the day). I am still pleased to have had the experience of an oxford interview (it honestly wasn't as bad as i thought it would be), but i think i will accept my offer from another uni for a subject i feel more passionate about.
I wish everyone the best of luck with their applications!