What Counter-Arguments can be said about the fact there is a 2 Party System in UK? Why may this be the case? (EX)

-The SNP has Control over Scottish Government -Labour had Collaborated with the Lib Dem’s in Wales after 2016 Welsh Assembly Elections -NI has its own Parties that assemble the Northern Irish -This can be due to the Different Electoral Systems used, and that Sun-National Elections can Benefit the Smaller Parties