cress
Links

http://www.solaplug.co.uk/ 

Simple Solar - The Retrofit Solution

Solar hot water heating is the best first step to reducing CO2 emissions for any household. It requires very little change in lifestyle and reductions of 400 kg of CO2 emissions per annum are typical – the equivalent to driving 3500 miles in a small car.
Up to 30% reduction in installation cost
No pipe cutting required
Existing plumbing system remains unchanged
UK design
Patent pending