What happens if I never repay or move abroad?
If you never repay due to consistently earning less than the payments threshold, once you reach 65 (for loans taken before September 2006) or 25 years from the first April of graduation (for loans after September 2006) your debts are wiped clean.
If at anytime you move abroad, you're expected to inform the student loans company so you can make repayments directly to them (usually by direct debit). Your repayments will be deducted in pounds sterling and you'd be responsible for any costs involved in converting the currency.
There are severe penalties if you don't tell the Student Loans Company, or chose not to repay by not providing them with information they request to be able to deduct repayments from your UK salary. These include tripling the normal rate of interest on your account, deducting repayments based on an income equal to twice the UK average earnings, and even demanding that you repay the total loan in one go…so beware!