The testing and research body said its decision was a direct result of evidence which emerged during the Grenfell Tower inquiry.

A BRE spokesperson said: “BRE no longer accepts any new work on behalf of Kingspan or Celotex following evidence heard during the course of this Inquiry.”

The Grenfell inquiry completed oral evidence last year and is currently writing up a final report.

A Kingspan statement said: Kingspan Insulated Panels [‘Kingspan’] notes the decision by BRE that it wishes to discontinue their relationship with any company that is part of the Kingspan Group, irrespective of product type, despite our products being in full compliance with relevant Building Regulations and with the test performance requirements of the relevant LPCB Loss Prevention Standards.

“There is no product performance or compliance basis for BRE’s decision, which Kingspan has already communicated to a majority of our customers last week.

“Kingspan Insulated Panels is committed to manufacturing and supplying products that adhere to leading global quality and testing standards, supported by extensive testing and certification of the highest integrity.

” Independently of BRE, whose certification is regionally focused on the UK and Ireland, Kingspan is certified by the globally recognised insurer testing regime FM Approvals, which carries out annual factory surveillance audits to verify our products comply with its global approval standards.

“Kingspan Insulated Panels’ products manufactured in the UK remain in full compliance with relevant Building Regulations and supported by independent certification via FM Approvals.

“Kingspan Insulated Panels are typically used in the external envelope and internal fit-out of a wide range of non-residential building types.”