IMHO:  Brexit, sorry to say, was the biggest mistake the British voter made.

"Leaving EU without a Brexit deal could cause major disruptions in UK" PBS NewsHour 8/17/2018

Excerpt

SUMMARY:  Two years ago, British voters decided in a bitter referendum to quit the European Union.  Now the country's imminent departure, possibly without an agreement between the two bodies, could cause chaos.  Special correspondent Malcolm Brabant reports on how Brexit has divided Britain and how some are preparing for a potentially difficult economic fallout.