Take the money you need to build a nuclear reactor. If it takes 15 years to build, with the same money you could have built a solar panel factory every year, the oldest of which would have built 15 years worth of panels and by the final year you'd be making enough panels to equal the output of the nuclear power plant every year thereafter.

If you focus tightly in on the gloomy and northerly UK then you may think nuclear still has an advantage, but if you treat global warming as a global problem then driving solar down its production curve makes much more sense.