Bright sunlight heats up the panels, which reduces their efficiency. That said, it can’t be denied that Britain’s latitude means its daylight hours vary from about 8 to 16 a day, depending on the exact location and the time of year.
Wind power is much less inherently variable when you have wind farms spread out over an area the size of the UK and surrounding seas. The problem is grid connections.
The UK is also very well suited for tidal power schemes, which are very reliable. So they have been refused by the previous Conservative government.
Clearly there should be a storage capacity based on various kinds of potential energy storage. I think too that domestic batteries have a part to play alongside microgeneration.
