Bills and accounts / Paying your bill

1. How are my monthly Direct Debit payments calculated?
2. How can I change or increase my Direct Debit payments?
3. Can I change the date of my Direct Debit payments?
4. Can I cancel my Direct Debit?
5. Can I pay my bill online?
6. How do I change my bank account details?
7. Can I pay my bill by phone?
8. Can I pay my bill at the Post Office?
9. Can I pay online without a payment slip or my 13-digit payment reference number to hand?
10. Can I pay my bill by credit or debit card?
11. Can I pay my bill by post?
12. How do I set up a Direct Debit?
13. How can I pay my bill?
14. Can I pay my bill at my bank?
15. What will happen to my payments if I use more or less water than was estimated?
16. Can I pay my bill at a PayZone?
17. Why do I have a problem making a payment online?