[Fluffywelshsheep]

Don't know what one is but you can get it from here

http://www.eaga.com/unison/

    *  Save up to £600 over the product's lifetime.
    * The eaga ShowerSmart is suitable for all non-electric showers and regulates the flow rate to that of a powerful electric shower.
    * For mains-fed showers (where hot water comes from a combi-boiler or similar), this saves both water and the associated energy with heating hot water.
    * For a 2-person household, the eaga ShowerSmart will typically save more than 12,000 litres per year*, cut carbon emissions by 1 tonne* of CO2 over its lifetime and save about £20* on gas and £20* on water bills (where metered) per year.
    * 15 Year manufacturer guarantee.

* Building Research Establishment

[minidax]

Thanks Linz, I have sent away for one, we have one mains shower.

Lu