I think it’s a crying shame that there hasn’t been more investment in solar
Geopolitics at play here I think, I agree that policies like enforcing roofs of new fulfilment centres to be covered in solar would make a lot of sense (people always go on about wasting arable land on solar panels, but you seen the size of the fulfillment centres used by Amazon, Asos, Next, Boohoo etc? Should be forced to build these with roofs strong enough to be covered in solar panels).
But China produces almost 80% of the worlds solar panels, and the West is essentially in a proxy trade war with China, so any pledge by the government to spend tens of billions on solar would, in reality, mean awarding billions of pounds worth of contracts to China.
There are some UK based solar panel manufacturers but they can't produce to the scale (or as cheap as you mention) to make much more than a dent to demand.
It will be the small modular reactors which will ensure our energy security, there are 6 companies through to the final stage of the tender process for contracts to build and operate and 3 are British, 2 are American, 1 Japanese. That is despite the Chinese being ahead in the race and having successfully finished building one this year, quite telling.
I'm a bit torn on nuclear. I accept that its the answer, but I'm definitely a NIMBY, wouldn't want to live near one (should be put in areas of high unemployment anyway, to replace lost industry). The fact that we can award many or most of the contracts to British companies to be made domestically is an attractive proposition also, and a welcome change as usually paying the French loads to build our nuclear facilities!
I'd snap up the opportunity to take a solar subsidy to put 16 panels on my own roof, to reduce my dependence on the grid though.