Don't know, I think it was more the view that a qualified electrician, having seen the dangerous state of the electrical system, basically just ignored it....presumably to the local authority environmental health dept, as HSE don't get involved with pubs.
Is HSE the correct enforcing authority for you?
Authority - the type of workplaces HSE is responsible for and those where Local Authorities have responsibility.www.hse.gov.uk
Perhaps had he given written notice to the landlord then that would probably been sufficient.
Notifying the duty holder should be enough I would have thought.