Grenfell cladding failed to meet safety standards
Fire tests carried out as early as 2014 showed cladding used on Grenfell Tower failed to meet the safety standards originally claimed by its manufacturer, a BBC investigation has found.
The firm Arconic knew the test rating had been downgraded, but the UK body that certifies building products said it was not told about the change.
An industry source, who has worked on a number of cladding schemes, said he believed there should have been a product recall.
Arconic said it did share the rating with "various customers and certification authorities".