That's not even the worst part, the UK government is claiming their preparations are proceeding on schedule and blames the pandemic for this, even though the EU has been able to operate checks on traffic out of the UK since January now.
From the BBC link above:
"The government's own preparations, in terms of systems, infrastructure and resourcing, remain on track to meet that timetable," she said, in a written Commons statement.
"However, the pandemic has had longer-lasting impacts on businesses, both in the UK and in the European Union, than many observers expected in March.