https://www.rmax.com/blog/mineral-wool-vs-spray-foam#:~:text=Mineral%20wool%20and%20open%20cell,a%20closed%20cell%20spray%20foam.
Looks like you could get boards of it to insulate walls? Or get someone to do it.
Easy to do when building a property I guess, not so easy when you have to rip plasterboard out of every single wall to fit the mineral wool :0(
@Sam started
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https://www.rmax.com/blog/mineral-wool-vs-spray-foam#:~:text=Mineral%20wool%20and%20open%20cell,a%20closed%20cell%20spray%20foam.
Looks like you could get boards of it to insulate walls?
Or get someone to do it.