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I saw it with my own eyes at a fire service demo in 2004 and have been advising clients against using anything other than rockwool ever since.
The building trade have known about this issue for years but hide behind "LPC approved" ratings and similar mumbo jumbo. A good example of this is the Grenfell Tower Regeneration Project planning document;
p. 6. Celotex say FR5000 has "Class 0 fire performance throughout the product in accordance with BS 476 [Part 6]" and that its "surface spread of flame [is] Class 1" with respect to BS 476 Part 7 (https://www.celotex.co.uk/products/fr5000 - link to Product Data Sheet PDF, August 2016, p. 2).
Another thing about PIR are the toxic gasses produced when it burns, particularly hydrogen cyanide. Again, this is well known.
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marcomarcos
That's interesting, and a little alarming (well, it's a commercial promotional video, it's meant to alarm you despite all the caveats they include) - I hadn't realised at all that PIR wasn't non-combustible.