Boris Johnson speaking at Government coronavirus press briefing

The video discusses the risk of new COVID-19 strains and the UK's response to mitigate this risk. It announces a ban on flights from South America and Portugal and the temporary closure of all travel corridors. Travelers entering the UK must present a negative COVID test taken within 72 hours before departure and complete a passenger locator form. Upon arrival, they must quarantine for 10 days or take another test on day five. The UK will enforce these measures strictly, with fines for non-compliance.

What is the duration of quarantine required upon arrival?

What additional test is mentioned for travelers on day five?