Thinking about applying for psychology at Leeds, would I be limited? Watch
A-level grades are more important than GCSE ones. In anycase GCSE Maths is no guide as to how well you will cope with the stats on a Psychology degree. Perhaps you can demonstrate in other ways on your personal statement you understand what Maths you will have to use.
If you are relatively good at statistics maybe state that you understand the level of statistical knowledge on a psychology degree course and are able to conduct statistical tests (t,tests etc) and understand their outputs. If you can read a stats book or do ttests and understand standard deviations and so forth write that in, it’s a good selling point. But of course, make sure you can do them because lying flags up. If you can’t that’s absolutely fine, I couldn’t when I applied and I still got in. Don’t panic, don’t focus too much on it, I’m sure you will do just fine.