I was in the office last week ( this is in London and it's regular guys on working class wages) Brexit came up. They all to a man opposed Brexit. Saw the debate about Brexit being about immigration. Didn't see Brexit as in there economic interests as well.
These are average working class people. They also saw end of free movement in EU negatively.
It's my common experience in London. Majority of working class people I know were remainers.
One Afro Carribbean friend , who is a postman, told me he was remain as people were going on about East European immigrants here in same way as they went on about his Fathers generation. The Windrush generation.