Just thought I would share this as I know a lot of people are struggling just now and I only found out about it recently.
If you have a student loan with SLC and don't make the repayment threshold for the year then you can claim back payments you have made. You can find the threshold limits on the gov website. I think in scotland it's £25k. If you get a refund then it means the balance goes back onto your loan so that's something to think of. I called today and they could go back about 10 years and check it was very simple.