How to keep cool with no ac?

You'll probably laugh at us. We're not used to heat in the UK like this, our houses are built for keeping in heat.

It's currently 26 c or 78 f. As the summer rolls on, it will probably reach 40 c or 104 f. The temperatures will probably get higher.

We are a nation of rain. Not heatwaves. And for anyone laughing at this. Spend a summer in the UK with no ac, boiling hot air, etc. But how do you keep cool in this heat?

If you want more context, read this article: evanevanstours.com/.../
How to keep cool with no ac?
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