This slow buildout will logically limit nuclear power to a minor role in the UK. By the time we could possibly build out large amounts of nuclear it seems likely we will already have built out large amounts of cheap wind power. With some battery storage and solar this can cover us for 90-95% of the year. For the remainder we will need dispatchable backup power. That will be gas and maybe at some point green hydrogen or its derivatives.

I suspect we will always keep around a little nuclear to maintain expertise for strategic national security reasons but it is hard to see nuclear power making sense in an energy market dominated by intermittent renewables like the UK.