If you pay by fixed Direct Debit, you will pay the same amount every month, but we will review this regularly to make sure you’re paying the right amount. You will always be given 10 working days’ notice before we change your monthly amount. With a fixed Direct Debit, you can plan ahead and don’t need to worry about paying late. You spread out your charges and avoid paying a lump sum. If you pay by variable Direct Debit, you will pay a different amount every time we issue a bill because your bill can vary depending on your consumption and meter readings, or other factors. On your bill, we explain that we are going to collect the full outstanding balance in one go. You will always be given 10 working days’ notice before we collect the payment. With a variable Direct Debit, you will pay less often. You don’t need to worry about paying late and you will always pay exactly what is due.