I think this is the specification of composite panel used on the building, it's PIR
https://www.celotex.co.uk/products/rs5000
Now look at the difference in performance between rockwool and PIR
https://www.youtube.com/watch?v=0shn-0UFHh4
That is absolutely brutal, the difference is stark, you wonder why the PIR stuff is not just completely banned, scary stuff!
@Bernhard started
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I think this is the specification of composite panel used on the building, it's PIR
https://www.celotex.co.uk/products/rs5000
Now look at the difference in performance between rockwool and PIR
https://www.youtube.com/watch?v=0shn-0UFHh4