 They prescribed permitted amounts of respirable dust at workplaces in coal mines as well as arrangements for the suppression and continuous sampling of dust, and they include a scheme for the medical supervision of workers at risk.The Protection of Eyes Regulations 1974 and 1975, replacing the 1938 Regulations, extended protection to those employed on construction sites as well as in factories.In addition, the Policyholders Protection Act 1975 introduced safeguards for customers of failed insurance companies.