If social class no longer determines party allegiance in the UK, what does?

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If social class no longer determines party allegiance in the UK, what does?

In the 1950s and 1960s the British electorate was described as aligned. The two most significant types of alignment were partisan and class alignment. As a result, the electorate in those two decades was seen as a stable two-party system. The Conservatives and Labour controlled the government and electoral changes in the United Kingdom were small and slow. However, since the 1970s we could observe a serious change. The electorate was not stable any more and changes were much faster and more sudden. The Conservatives and Labour did not dominate the party system any more. At first the Liberals began to get stronger, then the Liberal and Social Democratic Party alliance, and finally the Liberal Democrats. Besides, in Scotland and Wales nationalist parties started being important players. Since then single-party government has not always been possible to be achieved and parties have sometimes had to form coalitions (e.g. a Labour and Liberal coalition in the late 1970s or the Conservative - Liberal Democrat coalition now). This whole trend that has been happening since the 1970s is called dealignment, which is weakening of previous alignment, e.g.