Sorry Whitewavemark, forgive me for contradicting you, but I have NI origins and am there every couple of weeks visiting my mother.
The Conservative + Unionist Party are the mainstream historical Unionist Party.
The DUP are the 'Democratic Unionist Party', set up by old Ian Paisley and reflective of his fundamentalist religious views.
Unfortunately, Theresa May made a deal with them to shore up her minority government and they wield power far in excess of their size.
What's more, although they are the biggest political party in NI, they only represent something between a third and a half of the people of NI.
Personally, I find it appalling that 10 MPs are getting away with holding the UK, Ireland and Europe to ransom.