I am too thinking of applying for PPE and have done Maths, Economics, Philosophy and Combined English up to AS level and managed to achieve 3As and a B, respectively. I'm having the latter remarked because I do not believe my responses in the exams were of the level they marked it (2Cs). If it is then brought up to an A, I will pursue it to A2 along with the other subjects. But in the event that my grades are not changed, I will ditch it for an AS in Further Maths in its place. Do you think that might be an appropriate enough course of action?
My GCSE grades, by the way, are 3A*'s, 5As and 2Cs and a pass in GNVQ ICT - I went to a really shoddy comprehensive which may be soon shut down.