Could have saved the $21 billion spent to build the Chunnel if only tRumpus buddy Nigel Farage spoke up sooner.
It's not that simple in a globalised world. UK alone cannot take on US or China in any trade fight. EU can very much so. Brits should've pushed for change in EU and try to find allies, reform was preferential to running away.
Getting back sovereignty and the control over their borders comes with a price tag. This video explains how much that price tag is. Spoiler alert: it turns out to be higher than the Brexit proponents' predictions.