Thanks. Notably the winter peak is late afternoon/evening when solar can be discounted completely.
Fortunately there's usually plenty of wind at this time.
Even though I'm a leftie eco-weenie (at least by US standards), I'm also an advocate for the use of nuclear power - at least to provide baseload energy requirements.
If the UK had sufficient nuclear capacity to provide for at least 75% of winter baseload, it would allow for outages and maintenance on nuclear units whilst at the same time allowing for increasing use of renewables.
IMO the more important side of the equation is to reduce demand on grounds that it's likely permanent - and it saves money. Deindustrialisation has allowed the UK to significantly reduce energy consumption (or perhaps more accurately to offshore it to countries where they make things) but there's ample scope for individuals and businesses to make significant reductions.