Something even more long-term to illustrate how the Labour vote has changed. Between 92 and 2010 the Labour voters were in roughly the same average position on social liberalism scale (scales run -2 - +2 low is lib and left) more or less in the centre of the scale (at 0) 1/3 
They moved on average to a more liberal position in 2015 (as they gained liberal voters from LDs and lost socially Conservative voters to UKIP). This was further compounded in 2017. 2/3
Will need to wait a few months to be able to add the 2019 point - anyone fancy a game of pin the Labour vote on the chart? 3/3
The measures are a little different to usual to get the time series, only 4 items per scale consistent in all years.
