Almost all students pay their fees by taking out a Student Loan, this starts being repayable when you have completed your course and when your earnings rise over £25,000 per year. When you are earning above this you will only pay back 9% of anything you earn over £25,000.
What you pay is linked to what you earn not what you owe. If you never earn over £25,000 you never pay anything back. Any outstanding loans will be written off after 30 years!
Please note that these figures only apply to students who started their HE course from September 2012.