Buy the paper on the 21st March fill out the coupon and take it to a participating Sainsburys and get a free ShowerSave adapter.
The E.ON ShowerSave could save you up to £40 a year on your utility bills, by regulating and reducing the amount of water your shower uses. By creating a steady flow, it also maintains a more consistent pressure and temperature for your shower. You could start saving straight away as it's quick and simple to fit. It cannot be used on electric or multi-jet showers.