As solar appears on more and more roofs with their own battery storage there will be less and less call on the major grid power generators (and also more turbines).
If you mean gas turbines, then you're right. Because solar's very expensive and unreliable, we need to spend even more money on backup power generators that can cut in when it's dark, or the wind's wrong. Like at the moment where we have very cold weather and not much wind.
the problem with nuclear is the time it takes to safely build one and the time and horrendous cost to decommission it at end of its life (and would you live on the land of a decommissioned nuclear power station?)
The problem with nuclear is we've had decades of loony Greens and ecofreaks telling us they're a very bad thing. So we must cover the UK with wind turbines and solar panels instead. But living with nuclear power is pretty safe. So the only new reactors that have gone operational in the UK are inside 100x11m tubes with 100 people living in and around them, ie our Astute submarines and their RR PWR-2s
And because there's so much fear of nuclear power, that translates into regulatory costs and delays whilst they object. And the renewables lobby don't want nuclear either, because modular 1GW reactors provide low carbon power 24x7x365 at a relatively predictable cost.. Which is much lower than the cost of wind, solar and especially if you factor in the need for stand-by generation, grid upgrades, storage etc etc.
The renewables lobby will of course promise solutions to the problems they've created, but all they do is add more cost, which all UK energy users will end up paying.