First Past the Post only allows space for 2 big parties demonstrated in 1918 with the decline of the Liberals and rise of Labour and again sort of in 2015 with the decline of the Liberal Democrats . I mean , obviously the the bullshit that happened throughout the coalition contributed to their failure in the 2015 election , but FPTP didn ' t do them any favours . With the Conservative Party being so superior at the moment , Labour would be most likely to be replaced but with a party membership of just shy of 700 , 000 as of July 2016 , it ' s unlikely we ' ll see another political party break through anytime soon . As a side note , I also think we ' ll see a decline in UKIP over the next couple of years . Farage is an odd bastard and will hop ' over the pond ' and snuggle into bed with Trump in someway or another .