In the interview details email they send you there's a slip that you have to send back to them that you put 3 topics that you would like to discuss in interview, well for maths you do anyway. Just back from my interview and thought it went pretty badly, looking back at the questions I think I could do them without a problem now but at the time I was a nervous wreck! They say we'll hear on the 3rd of January but i'm certainly not optimistic.