As far as I know, nobody has done that kind of polling.
Some will vote tribally, the party they always vote for.
Some will vote for whoever they think aligns with their views.
Some will vote based on their Brexit stance.
Some will vote for a specific candidate.
*Not including Scotland. As with Wales, their natural choice is the SNP. Despite the fact the region has only 6 seats, it would probably be wise to have a backup for tactical voters that happen to hate the SNP...