Wind generation is king, apparently. I'm curious what the imports consist of, presumably natural gas but it's not indicated; however it doesn't seem to have that big of a reliance.

I think the imports refer to power transfers to/from other countries along interconnectors?

https://www.nationalgrid.com/national-grid-ventures/intercon...

The electricity maps site calculates the carbon intensity of the grid imports and lists it on the map and the country specifically views (click for more info):

https://app.electricitymaps.com/map/72h/hourly

As a general rule, the imports are imported because they are cheaper and generally cheaper means cleaner.

We import from France mostly, via the interconnects between our countries' grids. That means it's probably mostly nuclear.