Just a hunch, but I think heads may roll…
Panel maker for London tower gave warning

Diagrams in a brochure dated 2016 for Reynobond tiles reviewed by Reuters show how polyethylene (PE) core tiles are suitable only for buildings of up to 10 metres in height.

“As soon as the building is higher than the firefighters’ ladders, it has to be conceived with an incombustible material,” the brochure says.

The brochure was issued by French-based Arconic Architectural Products, which is responsible for the marketing in Europe of systems produced by US company Arconic, which owns Reynobond.

The Guardian and the BBC have reported in recent days that panels with a PE core were used in a refurbishment of the 24-storey tower bock that was completed last year.

Construction company Rydon Group, which undertook the work, and the local authority which owns Grenfell Tower declined to confirm whether the panels were PE.

[…]

Other diagrams in the Reynobond brochure show that panels with a fire retardant core - the FR model, according to Arconic’s website - can be used for buildings of up to 30 metres tall. Above that height, it says, panels with a non-combustible core - the A2 model - should be used.

Grenfell Tower is over 60 metres tall.

John Cowley, director of Omnis Exteriors which supplied the padding for the refurbishment but did not install it, told the Guardian that the company had been asked to supply the Reynobond PE variant.

The newspaper said the PE panels were £2 ($3.35) cheaper per square metre than the Reynobond FR option.

How much can they have saved? £8,000?