The rules on testing are to be eased for people travelling to England, the government has announced, following calls from the travel industry.
From 04:00 GMT on Friday, fully vaccinated travellers coming to England will no longer have to take a test before they travel.
And from Sunday, rather than taking a PCR test on day two of arrival, they can take a cheaper lateral flow.
The rules for self-isolating on arrival will also change.
The shake-up was confirmed by Boris Johnson earlier, following calls from travel firms who said the measures were not effective now that Omicron was spreading widely.
Under the current rules in force until Friday, all fully-vaccinated travellers over the age of 12 must show proof of a negative test lateral flow or PCR test taken in the two days before coming to the UK. Fully vaccinated people must also pay for a PCR test within two days of arrival and self-isolate while waiting for the result.
People who aren't fully vaccinated must currently take PCR tests on both day two and day eight after arriving, and self-isolate for 10 days.