More or less any numbers you see about the predicted economic impact of Brexit come from exactly the same sets of economists who have been proven 100% wrong so far about everything, so have no credibility. They predicted a massive recession in the wake of simply voting to leave, not actually leaving, which never materialised. Then there were claims it would be triggered by the formal notification of leaving - that didn't happen either. They also liked to claim that immigration had no impact on wages, but there have been quite a few stories since about industry leaders complaining about having to increase wages (suspect in and of themselves because immigration hasn't really fallen).
There simply aren't any economic projections of a trustworthy nature right now.
There simply aren't any economic projections of a trustworthy nature right now.