The real thing is the cost, the cost per kWh is falling so going nuke and locking in to a price that’s already above market makes no sense at all.
The Tories are ideologically opposed to renewables because of some weird culture war thing, plus they hate the idea of locally sustainable communities not being totally under the control of billionaires - people are a lot easier to scare into obedience when you can tell them their power might be shut off. The main reason though is huge projects can only go to huge companies, they don’t want lots of little solar farms they want their oil baron buddies to maintain their monopolies, that’s the only reason we still hear so much about this now allbut obsolete technology.