stuff like Enzyme? refers to their sound as mainly being 'darkcore', as do a number of sites online. is this related to the old uk stylee darkcore or just a coincidence?

Darkcore (I talk of the early 1990s) is getting to the hardcore once meant breakbeat in England thing again - that meaning "dark breakbeat" (and 
happycore for "happy breakbeat"). Darkcore, an old shortlived 1993 English style from Top Buzz and that - moody haunting minimalistic breakbeat with deep sub bass. That exact evolution goes into Drum & Bass. Check these links as there's various audio samples for this darkcore breakbeat. > and

If there is recent things coming out of Europe called "Darkcore" I would assume it just happens to share the same term but could perhaps have a loose musical relation to the old English style. I really could not say about Enzyme and most things of today what they are. 

Really there's few people speak of darkcore / happycore in the true old form 
unless they were around back then. The music has long since gone. It's getting to a stage there's less and less names for all this stuff and names  will become more duplicated in the future - but sound different. 

 would it be acceptable to remove the paragraph regarding happy hardcore from the hardcore techno article?

Unsure - certainly English happy hardcore (breakbeat) is not a sub-variant of 
hardcore techno BUT happy hardcore has a load of different meanings all over the place in different countries. They could easily be talking about "happy gabber" (happy meaning melodius and hardcore meaning gabber), things like "I Wanna Be A Hippy" type-stuff, as opposed to something else.

 how 'correct' is it to have hardcore techno in the industrial music footer template. 

I do think there is some relation from its very early origins. I am however no industrial fan - so have no idea.