The government's latest "traffic light" travel review is expected in the next couple of days.
It will place countries on red, amber and green lists - with different rules for testing and self-isolation.
What might change?
There was speculation the government was introducing a new "amber watchlist" of countries at risk of moving to red, but the BBC has been told this has been scrapped.
Holidaymakers planning a trip to France will be waiting to see whether quarantine requirements will remain in place, even though it is on the amber list.
What are the rules for returning from an amber-list country?
The vast majority of countries are on the amber list.
Adults fully vaccinated in the UK, the US and most European countries don't have to self-isolate upon arrival in the UK (unless they are arriving from France).
A Covid test is needed three days before returning from an amber country, and a PCR test two days after arriving.
Adults can prove they were vaccinated at least 14 days previously, via the NHS Covid Pass, or an NHS Covid Pass letter in England, and equivalents in the rest of the UK.
In Scotland, children over 12 have to take tests before returning home, and on day two.
What are the rules for green list countries?
There are only a handful of destinations - including Madeira, Croatia and Malta - on the green list. Nobody has to self-isolate after visiting them.
Returning from a green-list destination, you must:
You only need to self-isolate on return from these countries if your day two test is positive, you develop symptoms or NHS Test & Trace says you've travelled with someone who tested positive.
What are the rules for red list countries?
Red-list countries are those the UK government says present the highest Covid risk, and should not be visited "except in the most extreme of circumstances".
Dozens of countries are on the red list, including India, Pakistan, Turkey, Brazil and South Africa. If you have been in one in the last 10 days, you can only enter the UK if you are a UK or Irish national, or UK resident.
Returning from a red-list country - regardless of your vaccination status - you must:
- Take a Covid-19 test before departure and have proof of a negative result
- Complete a passenger locator form
- Self-isolate for 10 days in a government-approved quarantine hotel, booked and paid for in advance
- 10 days (11-nights) for one adult - £1,750
- Additional adult (or child over 11) - £650
- Children aged five to 11 - £325
Who decides if a country is green, amber, or red?
All countries go on the amber list unless there is evidence to suggest they should be on the green or red lists.
Ministers make the decision, based on advice from the Joint Biosecurity Centre (JBC), which looks at the Covid situation in each country.
Are other countries allowing tourists?
It is your responsibility to check the entry rules for your destination, which can change at short notice. Some countries only allow fully vaccinated visitors, or insist on a quarantine period.
The UK Foreign Office (FCO) provides detailed country-by-country advice.
Where can I get a Covid test for travel from?
Before returning to the UK you need to pay for a private test with high accuracy, such as a PCR or antigen test. Further tests may be required after you return.