I'm not sure I agree. The UK doesn't have a presidential system, but have first past the post and essentially have a 2 party system, with a small sprinkle of a third party.
Scotland has more recently shown shows that a single main representative of a losing minority in an independence referendum can win nearly everything against the multiple major parties on the other side. (Wales shows if your nationalist support is more lukewarm and unevenly distributed you get more unpredictable multiparty politics)
Northern Ireland is contested only by local parties with a longstanding religious/national identity division leading to two major parties for each side plus, and ultra tactical voting based on trying to figure out which of your factions' parties to unite behind this time to avoid the embarrassment of the local minority faction getting their candidate elected (and the non-sectarian fifth party being squeezed out).
None of the areas are particularly delighted with the results they are getting.
They have a different election system than the US.