Countdown to Brexit
June 2016:
Referendum. Vote in favor of leaving the European
Union.
March 2017:
UK formally triggers Article 50 and begins the
two-year countdown to the UK formally leaving the EU. Article 50
extended a couple of times.
31 January 2020:
UK leaves the EU and enters a transition
period
31 December 2020:
Transition period ends. UK leaves the EU
single market and customs union.
Then came Covid
The last pre-Covid quarter was 2019Q4.
Covid-19 appeared in 2020Q1.
Source: https://commonslibrary.parliament.uk/research-briefings/cbp-7960/