Investigators have been unable to determine the cause of the blaze that destroyed Charles Rennie Mackintosh’s Glasgow School of Art building in 2018 during its restoration by Page\Park.

They said too much of the fabric – including the fire alarm control panel and CCTV hard drive – was consumed in the fire, the second to hit the grade A-listed building in four years.

GSA director Penny Macbeth said she and interim chair of governors Kristen Bennie “share the frustration that many will feel that the exact cause of the fire has not been identified”.

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