With the g3 you could enjoy annual savings of around £400.

Start saving on your gas bills by installing the g-save economiser.
The g-save is a tried-and-tested, patented product that uses smart technology to optimise the operation of your central heating boiler, improving efficiency to greatly reduce gas consumption and lower your heating bills. The g-save works best on fully-pumped installations and can reduce heating bills by up to 31%.
The g-save has two electronic timers that each pulse at different pre-set times - 24-hours a day, seven days a week. One timer is wired into the room thermostat whilst the other is wired into the hot water cylinder thermostat wiring. The unit pulses the demand for heat so that the latent heat in the system that is still moving around is used to full effect even when the boiler is not active, thus making substantial savings on gas usage.

Keep an eye on your electricity bills with the OWL® Wireless Micro Electricity Monitor (model: TSE006-001).
The monitor shows you how much electricity you are using at any time of the day. It can help you to save money off your electricity bill by providing up to the second information on the amount of electricity you are using in pounds and pence so that you can see the financial gain of turning off electrical devices!
Whether it's turning off an appliance at the plug rather than just using standby or simply turning off a light, the monitor shows you how changing your behaviour can save you money and so help the environment.
It is easy to install, easy to read and easy to use.
Accessories
(This product is not suitable for 3 phase installations. The Micro is configured for UK only.)
Would you like cheaper gas and electricity? Of course you would!
gas-elec group Compare makes it possible for you to enjoy significant savings on your annual fuel bill at the click of a button. With ge-switch the fuel comparison calculator compares gas and electricity prices from the widest range of energy suppliers. This means that you can find the best possible deal for your gas and electricity (combined or individually).
ge-switch will also periodically check that your deal is still the best one around - a review is done every six months and if a better deal is available, we'll do the switch for you at no cost!
With the g3 you could enjoy annual savings of around £400.