Noel Park estate in north London has also suffered due to loss of original windows and doors, rendering, inappropriate roofing materials and loss of boundary walls, the organisation said.

BBC: London's unique areas 'at risk'

The Other Building Materials and Equipment Business segment offers wooden interior furnishing materials, interior fabrics, external tiles for houses and buildings, internal decorative tiles, siding, stone materials, roofing materials, precut products, and solar power generation systems.

FORBES: #1,274 Lixil Group

At present, some 500, 000 tonnes of slate a year is produced in the quarry for roofing, architectural materials and construction.

BBC: Penrhyn Quarry wins Welsh government loan help