Thanks for pointing that out - I guess I was a bit hasty with that source. It's not showing quite what I thought it was. Live data and percentages which can total more than 100%. Here is a better one that shows in 2023 solar was 4.7% of the overall electricity mix. And another source showing 5.2% in 2024.

[0] https://www.iea.org/countries/united-kingdom/electricity

[1] https://www.renewableuk.com/news-and-resources/press-release...

So presumably ~6% in 2025, that seems excessive as the UK is such a horrible location for solar. However at such a low percentage across so many locations there’s no need for storage, minimal transmission losses, etc which presumably means it’s not actually a bad idea.