Ah, Jean Pierre, you missed the memo. HNC is, as I recollect, the Higher Normal Course, and is apparently the standard curriculum in the UK for training electrical technicians. The course material and syllabus was apparently set about 20 years ago by a bureaucrat that once walked through a factory that had PLCs in it.
A number of our frequent and truly professional contributors have confessed to being graduates of this program, so apparently the course doesn't do any permanent harm. It does beg the question, though, about what is covered in the "Lower Normal Course", doesn't it?