US shareholders in Grenfell cladding firm Arconic have been given the all clear by a court to take legal action against the company after witnesses said that senior staff at the firm knew the cladding was dangerous.

The US investors say they have incurred financial losses after Arconic’s Reynobond PE aluminium composite cladding (ACM) was found to have contributed to the deadly blaze at the tower, which killed 72 people in June 2017.