Health and Safety at Work Act 2015, s 22
Under the health and safety laws, the employer’s obligation to do everything “reasonably practicable” means doing everything that they’re reasonably able to do at the relevant time. What is reasonable here will depend on:
how likely it is that the particular hazard or risk will arise
how much harm could result
what the employer knows (or should know) about the hazard or risk, and about how it can be eliminated or minimised
whether ways of eliminating or minimising the risk are available at the time and are suitable
the cost of removing or minimising the risk.