From 0400 GMT on Feb. 11, fully vaccinated inbound passengers will only have to verify their status on a passenger locator form, he said. For now, fully vaccinated will not include a requirement to have had a booster jab. Under 18s are treated as fully vaccinated passengers. Those who do not qualify as fully vaccinated will no longer have to isolate, or take a test on day 8. They will still have to provide proof of a negative COVID-19 test before travelling and take a PCR test after arriving in Britain, he said.