I’m surprised that no-one has mentioned cash back sites, such as Quidco. There are often great deals to be had through them. I always check around when a renewal is due. I recently changed my broadband and phone deal to a new company, through Quidco. I got £100 cashback, a £100 storecard from the new company, and monthly charges comparable to my previous deal.
Shopping around can be a pain, but there can be some good savings.
Valeriej43. If you sign up for a water meter you can change your mind, in the first year, have it disconnected, and revert to the old payment method. I used to help out in our local shop, which had a bill-paying machine. I used to tell all our elderly customers to apply for one, and received lots of grateful thanks for the savings they made.