I think it's definitely worth applying - you have great GCSE results and your AS Levels and predicted A2 Levels look really impressive, so I think you'd stand a good chance - it's definitely worth a shot, at least, just so you know. You can always apply to a few other universities too, in case it doesn't work out, but if that was me and I was keen to go to Oxbridge, I would go for it. Good luck!