The pattern for the Stickies and Vanguard is quite interesting. As for the Unionist split, Candidates? (Also The highest bracket in the "UUP - Anti-White paper" map reads like 80 to me, surely 30?)
Vanguard's was quite a surprise; I'd always assumed they were mostly a Belfast affair. Suppose they did so well in Armagh because all the UUP candidates (yes it was a candidate issue - pro-white paper candidates signed a pledge) were pro-white paper.
Note of hilarity for those that don't know this; most of the current generation of senior UUP figures (from Trimble onwards) were in Vanguard in the early '70s.
I would argue this:
The first proper Socialist party on the island of Ireland (originally established as the Belfast Labour Party) and nonsectarian in politics if not in electoral appeal.
I would argue that the ILP (to keep it simple) was 'socialist' at least from its founding in iirc 1911 to the mid 1920s. Look at its role during the lockout and the Strikes of the early 1910s. It was actually then one of the more left wing parties in Western Europe in its very early period.
The BLP (which expanded into the NILP in 1924) was established in 1892, a few years even before Connolly's first effort. Though, yeah, a hell of a lot more moderate than Irish Labour in its first decade. To risk laughable understatement, actually.