23.01.2020 sai kuningliku heakskiidu seadus, mis võimaldas Suurbritannial Euroopa Liidust välja astuda (European Union (Withdrawal Agreement) Act 2020).

Loe lähemalt:
Legislation.gov.uk, „European Union (Withdrawal Agreement) Act 2020“;
UK Parliament, „Bill stages — European Union (Withdrawal Agreement) Act 2020“;
The Guardian, 22.01.2020, „Brexit bill passes parliament as Johnson overturns Lords amendments“