Popular foreign tourist destinations have been added to the green travel list this summer, but some countries have toughened up requirements for entry.
At 4am on Monday, Bulgaria and Hong Kong will be added to the green list and Croatia and Taiwan will be moved onto the green watch list, meaning they are in danger of being put on the amber list.
People arriving in the UK from green list destinations are not required to self-isolate, although the four nations all have their own lists.
Each of the green list destinations have their own testing and quarantine rules for travellers arriving into the country.
So what does it mean when countries are added to the green list and will you need to quarantine when you arrive in any of them? We have all the details for you.
Which countries have recently been added to the green or green watch lists?
What does it mean when a country is on the green list?
People who are travelling to countries on the green list from England will still need to take a Covid test up to 72 hours before they return to England and a single PCR test on or before day two of their arrival into England - but you do not need to quarantine unless the test result is positive.
Children aged four and under are exempt from the test.
ITV News video producer Natalia Jorquera explains what the changes could mean for you
Do I need to quarantine or take a test on arrival to Croatia, Bulgaria, Hong Kong or Taiwan?
To avoid quarantine in Croatia you must present a negative Covid-19 antigen or PCR test, or proof of vaccination, or a doctor’s certificate of recovery following a positive test result between 11 and 180 days prior.
To enter via proof of vaccination you must have had either a two-dose vaccine course from Pfizer, Moderna, AstraZeneca, Gamaleya or Sinopharm or a certificate of receipt of a one-dose vaccine such as the Johnson & Johnson jab.
Croatia will accept the NHS Covid pass both as a letter or via the app.Children under 12 are exempt from the requirements.
If you have not got any of the accepted ways of gaining entry, a test can be taken upon arrival in Croatia but you will have to self-isolate until you have the result.
Bulgaria has a similar green, amber and red travel system to that of the UK.
The UK is currently amber on Bulgaria's list.
This means if you are entering Bulgaria from the UK you must present one of three documents.
First, a vaccination certificate indicating an approved vaccine schedule has been completed at least 14 days before arrival.
Second, a document showing a positive result from a PCR or rapid antigen test for people who have recovered from Covid-19.
Third, a negative PCR test performed within 72 hours before entry into Bulgaria or a rapid antigen test performed up to 48 hours before entry.Additionally, at least 5% of all arrivals from amber countries will be subject to a rapid antigen test at random.
If you test positive for Covid-19, you will be required to self-isolate for 14 days.
There is also a mandatory 10-day self-isolation requirement for anyone who has been in close contact with someone who has tested positive for Covid-19.Bulgarian authorities have said they will only accept the letter version of the NHS Covid pass, not the app.
If you do not have any of the documents required for entry then you must quarantine for 10 days, this can be shortened after receiving a negative test.
If the UK was ever raised to red, then all people arriving in Bulgaria except Bulgarian citizens would be refused entry.
The UK is currently on the Hong Kong government's list of "extremely high-risk places".
This means anyone except Hong Kong residents arriving from the UK will be refused entry.
Taiwan has not allowed any foreign nationals to enter since the start of the pandemic and there is no indication as to when this rule will change.
Anyone seeking entry must seek special permission from the government.
What other countries are already on the green list and what are their rules?
To avoid quarantine in Malta, Brits now need to be fully vaccinated.
Authorities in Malta have revealed they will only accept printed letters sent by the NHS as proof.
These letters can take "up to five working days" to arrive, which means British tourists - even those who are fully vaccinated - could be turned away at the airport or the Maltese border.
This also applies to children aged between 12 and 16, who will not be allowed to holiday on the island unless they have been fully vaccinated.
Children under 12, however, will be permitted if they are accompanying parents or guardians who have had both doses.Those aged between five and 11 must also show evidence of a negative PCR test taken within the previous 72 hours.
No test is required for those aged under five.
The addition of two holiday destinations (Bulgaria and Croatia) to the green list which allow entry to UK visitors will be welcome to many because most of the places on the green list do not allow British people to enter.
To enter Madeira, you must have proof of a negative Covid-19 test or have had both doses of the Covid vaccine at least 15 days prior to travel.
Passengers must take a PCR test 72 hours before travel and upload the test result - children aged 12 and under are exempt.
If you have had two doses of a coronavirus vaccine, you will be exempt from showing a PCR test on entry and Madeira will accept your NHS letter to demonstrate your vaccination status.
All passengers (except for children aged 12 and under) will need to complete and submit a traveller questionnaire.
Australia, New Zealand and Singapore
Australia, New Zealand and Singapore are all closed to foreign tourists.
If you are fully vaccinated, you must upload your vaccination certificate on the Passenger Locator Form.
You must also book a Covid-19 lateral flow test before arriving in Gibraltar.
This test must take place within 24 hours of arrival.
If you are remaining for more than seven days, you must also take a second test on day five.
Brits can travel to Iceland if they can prove they have been fully-vaccinated against Covid or have recovered from the illness.
Travellers who have been vaccinated or recovered from Covid outside of Israel must isolate on arrival in the country until they take an antibody test and test positive in an accredited Israeli laboratory.
If you want to travel to Anguilla, you will need prior approval from the government's health team. You can apply online here.
If you are accepted, you will need to provide evidence of a negative PCR test taken three to five days before the planned date of your arrival.
If you are fully vaccinated you will need to self-isolate for seven days on arrival, and if you have not been fully vaccinated you will need to self-isolate for 10 to 14 days on arrival.
Antigua and Barbuda
Passengers aged 12 years and above must provide evidence of a negative PCR test. On arrival, passengers must complete a Health Declaration Form and will be subject to temperature checks by Port Health Authorities.
All arrivals will be monitored for coronavirus for up to 14 days. The Ministry of Health says it is the decision of the Quarantine Authority on who must self-isolate or quarantine on arrival.
British Indian Ocean Territory
The British Indian Ocean Territory (BIOT) is not a tourist destination.
All travellers from the UK arriving in Barbados must present a negative Covid PCR test taken no more than three days in advance of your flight's arrival, but unvaccinated and vaccinated arrivals will be required to spend some time self-isolating.
Passengers must also submit an Embarkation/Disembarkation (ED) card 24 hours prior to travel, to which they should upload their negative test result via Travel Form.
If you arrive in Barbados from the UK without a negative PCR test you may be denied entry to the country.
Passengers must complete an online questionnaire 24 hours before arrival and have a PCR test 72 hours before landing. Both must be submitted prior to entry.
A pinprick Rapid Diagnostic Test (RDT) will be taken on arrival. If the RDT is negative, then the traveller must self-isolate in a government-certified facility for five days before having a further PCR test. If it is positive, a further PCR swab test will be carried out. If the PCR test is positive, a 14-day quarantine will be necessary.
Pending a negative PCR test administered on entry, travellers will be required to quarantine for up to 48 hours. All travellers must pre-book approved quarantine accommodation and pre-pay for their test.
For vaccinated arrivals, you will have to take a rapid Covid test at the airport or at your government-approved accommodation and you will have to remain on the premises of your accommodation and follow the quarantine rules until you receive the results of your second test.
If you test negative you will not have to quarantine further, but if the result is positive you will be required to self-isolate - you will be transferred to the government isolation facility for 24 hours and you can then request to self-isolate at your holiday accommodation or government approved isolation property.
On arrival, you will have to quarantine at approved facilities - either a designated hotel, villa or a government approved facility - and you will be required to take a second PCR test five days after arrival.
You will need to remain in your hotel room, and may be required to wear an electronic tracking bracelet until you receive the results of your second test - if it's negative you will not be subject to further quarantine.
Airports in the Cayman Islands are closed to all inbound and outbound international passenger flights.
Only resident permit holders and Montserratians are allowed to enter Montserrat.
Turks and Caicos Islands
Anyone arriving to the Turks and Caicos Islands is required to obtain pre-travel authorisation via the Turks and Caicos Islands Assured Portal.
This requires evidence of a negative Covid-19 test from a reputable facility taken less than five days prior to arrival in the Turks and Caicos Islands, proof of health/travel insurance with Covid-19 cover and a completed health screening questionnaire.
What other countries are already on the green list?
The addition of Malta, Balearic Islands and Madeira will be a welcome addition for travellers returning to England, as the majority of countries previously on the green list are closed to international tourists, such as Australia, New Zealand and Singapore.
Here are the other green list countries:
South Georgia and South Sandwich Islands
St Helena, Ascension and Tristan da Cunha