Student Loans are given and charged at an interest rate the same as the rate of inflation (effectively makes them interest free) - when you leave university and start earning money, your employer notifies the Inland Revenue that you have a student loan, and the Inland Revenue will put procedures into place to start taking bits off your wages to pay it back.. HOWEVER, the rules that have to be fulfilled before money will be taken from your wages are so complex - you have to be earning above a certain amount before tax, be paying less than a certain amount in tax, be working a set amount of hours per week, etc, that a lot of student loans will go unpaid through no fault of the student (or ex student) for many years, when I believe they are simply written off, or the individual is invited to pay the money back at their leisure.