You can set up a Direct Debit online.

All the normal Direct Debit safeguards and guarantees apply. No changes in the amount, date or frequency to be debited can be made without notifying you at least ten working days in advance of your account being debited. In the event of any error, you are entitled to an immediate refund from your Bank or Building Society. You have the right to cancel a Direct Debit instruction at any time simply by writing to your Bank or Building Society, with a copy to us.