Even if you don’t have a meter, you can save money by saving water. At £20, aerated showerheads should pay for themselves within a year. Savewatersavemoney.co.uk has another idea: tap inserts. Kitchen taps can run at 15 litres a minute, sending hot water down the plughole. Fitting a £5.99 gizmo slows the rate to 3 litres a minute, and saves money, year after year after year.