FWIW at my selection day degree you did, doing Maths at A-Level didn't seem to matter. Whilst most of my fellow applicants had done some sort of engineering degree (thus requiring Maths at A-Level) there were a fair few candidates who had degrees in completely unrelated topics, not done further than GCSE maths and had little to no flight experience. Having said that, this was OAA so CTC may have been different.