How to complain about a bank, energy supplier or water company in the UK — and get compensation
Complaints here run on a clock: a bank has 8 weeks to reply, a telecoms provider 6, a water company 10 working days at each of two stages. Miss the deadline or fob you off, and an ombudsman takes the case for free — with a decision the company must honour. Who covers which sector, what to put in the letter, and why big purchases belong on a credit card.
16 September 2026
