Explanation

 The United Kingdom voted to leave the EU in a national referendum in June 2016,

and left in 2020.

The United Kingdom left the European Union on 31 January 2020, at midnight (Dutch time).

Theresa May was prime minister at the Time of Brexit

Brexit is the withdrawal of the United Kingdom (UK) from the European Union (EU) and the European Atomic Energy Community (EAEC) .

The UK is to date the first and only country to formally leave the EU after 47 years of membership