Just out of interest I stuck my details into the East Suffolk Council linked supplier earlier today and it came back with the follwing quote
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I don't know the size of the panels, their output or the size of my roof before anyone asks, but a later quote using a different email address and a guessed roof size of 6m x 3m suggested 6 panels with a total price of abour £8300, but I didn't save that one andthe house is ESE/WNW orientated.
I'm not sure it's worth it being a very low user - even in winter I'm only using about 160kWh per month, although this will probably increase now I'm part retired.