Think as far as the economic argument there is no need to pursue this any further.
Brextremists simply can no longer argue that the U.K. will be better off outside of Europe.
Since the referendum, sterling continues to fall against most important currencies, inflation is rising, interest rates will rise, debt is increasing exponentially again. Wages are stagnating, business is less confident about the future then it has been for ever, businesses are planning an exodus from the UK, there is clear evidence that the rest of the world will continue to pursue trading with the EU because of its massive customer base and shows little interest in the UK regardless of what the Brextremists are giving out as propaganda. There is of course a huge amount more evidence. This is not remoaning this is fact.
Brexiters have lost the economic argument.