Kingspan, the company, through their technical department can advise on any application of their materials from every aspect including that of fire regulations. Their website also carries solid information on the subject. http://www.kingspaninsulation.co.uk/Knowledge-Base/Facades---Fire-Safety.aspx
If you have any doubts gives them a call.
Kingspan products are for the main part constructional, they aren't used as interior wall cladding or for ceilings where there is a decorative requirement. Thus you tend to find them inside cavity walls, in floors and under exterior cladding.
The real killer in a fire isn't correctly specified polyurethane
inside walls and floors, but polystyrene
in the form of tiles and coving; it burns very fiercely emitting dense toxic fumes. I suspect that maybe what got the unfortunates in the French Bistro
A lot of this polystyrene stuff was applied in the 70s without much thought; not sure what the fire regs say about it now.
No connection to Kingspan other than as a satisfied end user.