it has little to do with energy security
In 2003, we were a net exporter of gas. By 2030 we expect to be importing close to 75% of the gas we consume. By making the most of our home-grown gas we can safeguard our own domestic supply whilst also cutting our carbon emissions.
Subsidies have never been anything like as high for renewables as they were for nuclear, Hinckley Point anyone?
Barring miraculous breakthroughs in energy storage technology within the next few years or a populace that is willing to freeze in the dark when the sun doesn’t shine it is simply not possible to replace baseload generation from Hinkley with intermittent solar power.
offshore wind is currently more expensive and that a rise in wholesale prices would cut the implied subsidy in future.
We rely on communal purchasing power for most things
Your trying to have it both ways, either its a communal countrywide energy policy or locals have the ultimate say and force them to buy their own solar/wind farms they dont even want.
Unfortunately very few individuals can do that (go off grid)
Not true, there are plenty of people who live 'off grid', you can buy solar panels for several hundred pounds but I don't think you would be to happy to give up your hot baths in the winter.
You also need to check where the vast majority of energy in the country is currently coming from
We import 40-50% of it
initial explorations near Blackpool caused localised earthquakes
Big deal, earthquakes occur all the time, so a chair fell over... we aren't talking Fukushima.
fossil fuels need to be left in the ground if we are to avoid catastrophic global warming
So we give money to other countries to frack gas, use lots of energy to liquefy it, ship it across the worlds Oceans (polluting them) just so we can say 'aren't we environmentally friendly'. Again 
It might be time to remind you who our government is actually working for
Yea employ people in dictatorships to produce our energy overseas or employ people in THIS country to produce our energy. Yea, who are you working for?
The solution is easy, shale, nuclear and renewables until some miraculous time in the future when windmills and sunshine can produce 100% of our needs, 100% of the time, 24 hours a day 365.25 days of the year.