the employer's duty under Health and Safety at Work etc. Act 1974 s.2(1) to ensure, as far as reasonably practicable, the health, safety and welfare of an employee applies regardless of whether head office personnel or senior management were responsible for a failure to maintain safety standards.
For relevant general notes see Health and Safety at work/criminal offences and/or Acts of Parliament etc/Corporate Manslaughter and Corporate Homicide Act 2007 .