[simonh]

I should have said they were the sting demographic.

Skilled manual workers is a very specific, carefully selected sub-group of manual and low income workers, chosen just for the purposes of the narative. Why that specific sub-group? A lot of skilled manual workers are even middle class.

Middle class voters are the majority of voters, so they account for well over 59% of remain voters as well. Manual labour and low income voters made the break though, no other significant demographic was more likely to vote for Brexit.