No it's not a dodgy '24' rip off for the innumerate!
It's a cool March morning here in Newcastle - the Beeb is saying a max of 11°C outside. I've just been up to see how my solar hot water panel is doing - the collector is at 36°C and the water in the tank is at 26°C, and this will continue to rise over the next few hours. That might not seem much, but it is about 20°C that the combi boiler doesn't have to heat the water - saving over a third of the energy required. Just imagine what it would be doing if our house wasn't pointing the wrong way (or in a valley).