What is assumed each social class would vote for:
C1 - Conservative / Labour
C2 - Labour / Conservative
However there’s party dealignment: less than 50% of DE have voted Labour since 1997, apart from 2017 due to Corbyn‘s traditional Labour views.
There’s been a decline in AB supporting Conservatives since 1997, less than 50%.
More DE have started voting Conservative particularly due to Brexit. More middle class have started voting Labour over the last 20 years.