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"...we often have a few weeks with low wind..."

Plenty of wind up North + Scotland - just no means to transport it over where the most demand is (the South).

Not always. Often, but not always, and that's the problem. This afternoon for example, even off the East Coast of Scotland the wind was about as brisk as a stroll with your elderly grandmother. If you've got 10GW of wind turbines, but they're running at 5% output, that's 500MW, which isn't nothing but it's not even enough for Scotland.

But it was windy in Ireland, Portugal and the Baltic sea.

https://www.windy.com/?100m,50.958,4.345,5

Yes grid.iamkate.com is brilliant, and it has good insights into costs. However, I just like the 90s skeuomorphic design of gridwatch.templar.co.uk, makes me think of simpler times.

Wow that website loads surprisingly fast

It's almost entirely static (or at least server rendered) even all the SVG graphs. I'm going to take punt and say it's a static pre-rendered flat file based on the response time.