Which of the following is an example of a regulatory body?

The Health and Safety Executive (HSE) is an example of a regulatory body because it is responsible for enforcing workplace health and safety legislation in the UK. Its primary role is to prevent work-related death, injury, and ill health by regulating and promoting safety standards across various industries. The HSE has the authority to create regulations, conduct inspections, and enforce compliance to ensure that employers adhere to required safety practices and protocols. This regulatory function is crucial for establishing safe working environments and protecting employees' health and welfare.

In contrast, while the other entities mentioned play significant roles within their respective fields, they do not function as regulatory bodies in the same enforcement capacity. The National Health Service (NHS) provides healthcare services; the British Standards Institution (BSI) develops standards but is not an enforcement body; and the Trade Union Congress (TUC) represents trade unions and advocates for workers' rights, which is more about representation than regulatory oversight.