Good points Scott,
But if its not reported it cant be used as statistical evidence. Hearsay or anecdotal stories don’t carry much weight.

Statutory regulation would not prevent "fly-by-night" companies servicing or maintaining medical equipment. I presume that you don’t mean OEM's?
But, competent EBME leadership or Biomedical Management would check into the allocation of contracts to third party contractors, and check service engineer qualifications, and the quality of their work.

NHS Pay gateways have an element of competence which must be attained detailing theoretical knowledge and practical skills, (more than adequate to regulate who services or maintains classes of medical equipment).