You might find the Gyproc (regular wallboard)is the type of non-combustible material Blue Star is referring to. It is a fire-rated building product.
You could call Bluestar just to confirm, but that item of guidance (non-combustible surfacing) is quite standard in a lot of range/cooktop installation guides.
It's there so that you don't decide to install a nice run of pine beadboard behind the stove. :)
The following is a technical blurb from the Gyproc Plasterboard site.
"Reaction to Fire
Plasterboard linings provide good fire protection owing
to the unique behaviour of the non-combustible gypsum
core when subjected to high temperatures.
Within national Building Regulations, plasterboard is
designated a Âmaterial of limited combustibilityÂ.
As a result of the performance achieved when tested to
BS 476: Part 6: 1989 and BS 476: Part 7: 1997, the surfaces
of Gyproc plasterboards and the exposed plasterboard
surface of Gyproc thermal laminates are designated
Class 0."
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