Highly unlikely because the rich are now just running away from UK pulling all their cash with them; it's likely that leftists will get what they want - reduction of wealth inequality - just not in the way that pleases them: with the cash being simply gone.
Sounds good to me. The problem is the rich don't actually take their money and fuck off, they just keep owning wealth here forever. I expect that won't change until the UK gets an actual leftist government, which seems unlikely to happen in the next 10 years.