For the best possible saving, you can make in your own property from a solar PV installation.

The majority of people in the use 3500 kwh of electricity per year in a property, have gas central heating and a 110 litre water tank. They will use about 10 kWh of electricity per day on an average. There electric bill will be about £450 + Vat per year + standing charge and gas bill about the same. A total utility bill of £1000.00 per year.

I would recommend the following:
A. 2.0 kW Solar PV system if facing south or a 2.5 kW system if facing East or West
This will give you a total generation of 1784 kWh per year within Lincolnshire.

I expect you to use 1200kWh within your home, reducing your bill for your electric by 1200 X 12p = £144.00 = 5% VAT Total £151.20

The FITs are as follows:

Total generation 1784 x 12.97 = £231.38
Export 1784/50% x 4.8 p = £42.81
Fit an automatic switch for your hot water tank saving 500kWh per year 500 kW x 12p = £60.00
Fit Energy saving light bulbs, saving 1 kW per day on average over the year, saving 365 kW @ 12p = £43.80

Install a boiler controller saving up to 20% on your gas consumption over a year. 16500 less 20% = 3300@ 3.4p per kw = £112.00 per year
Total savings
In-house savings from solar PV £151.20
Boiler controller saving £112.00
Low energy lighting £60.00
Fits payments £231.38 + £42.81= £274.19
Total savings = £537.39 per year

Costs fully installed (approx):

Solar PV system 2 kW £3500.00
Boiler controller £400.00
Low energy lights £200.00 (quality light bulbs with 3 year warranty)
Hot water switch £360.00
Total cost £4460 + VAT 5% = £4683.00
Payback time £4683.00/ £537.39 = 8.7 years.