Harley Facades marked Grenfell cladding drawings “approved for construction” even before they had been seen by architect Studio E, the Grenfell Inquiry has been told.

Subsequent drawings marked “as-built” by Studio E contained errors such as referring to zinc cladding despite this being swapped out for cheaper aluminium in a cost-cutting process long before construction work had even begun.

Main contractor Rydon’s senior manager on the project, Simon Lawrence, admitted this was a “serious mistake” under questioning from inquiry barrister Richard Millett QC.

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