The U.K. Government have in place 20 year long financial incentives for installing solar pv on your property.
The government backed feed in tariff pays you for every unit of electricity your produce with you solar pv system. You will currently receive
4.39 p/kWh of electricity you generate and use
4.85 p/kWh of electricity you sell back to the grid
A 20 year long income from the tariff