Asbestos is a naturally occurring mineral that was commonly used in building materials in the UK until the early 2000s. It was valued for its heat resistance, strength and durability, and was used in a variety of applications, from insulation to flooring to roofing. However, it was discovered that exposure to asbestos fibres can cause a range of serious health issues, including mesothelioma, lung cancer and asbestosis.

As a result, the use of asbestos was banned in the UK in 1999, but many buildings still contain asbestos-based materials. These can be safely managed if they are not disturbed, but if they are damaged or deteriorate over time, the fibres can be released into the air and become a health hazard.