My mother in law has just had solar panels fitted to her roof - at the age of 91.
This set us thinking that perhaps, having a large house with commensurate high bills (electricity bill is about £1,200 a year) and a good-sized WSW facing roof we are likely to benefit considerably from having some installed, so we are investigating.
A friend recommended the Energy Saving Trust as a good starting point: http://www.energysavingtrust.org.uk/
On this site it says that for specific questions contact the Renewable Energy Association: http://www.r-e-a.net/
We've found this site to enable us to compare the various panels on offer, which we've consulted and found very useful:
September: We've now ordered a 16 panel system, paid the deposit and had the survey done - will let you know how it pans out. It's due to be fitted in about two weeks time.
22.9.11: The panels have arrived, they're pretty big and are scheduled to be installed next week, fingers crossed.