Editor's note: Coronavirus cases are in flux across the globe. Health officials caution that staying home is the best way to stem transmission until you're fully vaccinated. Below is information on what to know if you still plan to travel, last updated on March 18.
(CNN) -- If you're planning to travel to the UK, here's what you'll need to know and expect if you want to visit during the Covid-19 pandemic.
The United Kingdom has seen one of the highest number of deaths from Covid-19 in the world, resulting in multiple lockdowns. Most recently, the Omicron coronavirus variant spread across the UK.
In England, Scotland, Wales and Northern Ireland, most legal coronavirus restrictions have been lifted, but regulations continue to slightly vary across the four nations. See more details below.
The UK removed all remaining Covid-19-related restrictions on international travel on March 18. See more information below.
What's on offer
In London, the UK has one of the world's greatest cities. But beyond the architectural marvels and nightlife of the capital, there is much to explore -- the rugged peaks of the Scottish Highlands, distant Welsh lakes and the wide sweep of Cornish beaches, for starters, plus historic towns and cities such as Bath, Oxford and Harrogate.
Who can go
Anyone can enter the UK without any additional testing or quarantine requirements, regardless of vaccination status.
What are the restrictions?
UK arrivals no longer need to fill out a Passenger Locator Form before arriving in the UK.
Red list countries
The UK divides destinations into "red" and "green" destinations. There are no longer any countries on the red list.
Previously, certain arrivals from red list countries were required to quarantine in designated hotels, but the UK government has announced that the infrastructure for hotel quarantine will "be fully stood down" by the end of March 2022.
The government has said it will "maintain a range of contingency measures in reserve" which could be activated if concerning coronavirus variants emerge.
The UK government had previously said if red list restrictions needed to be reintroduced, home isolation would likely be the preferred option.
Green list countries
Any destination not on the red list is considered green -- so currently all destinations are green -- but some green destinations don't currently permit nonessential travel from the UK.
Anyone -- regardless of vaccination status -- from green list countries can enter the UK without any additional testing or quarantine requirements.
For full UK government guidance on traveling to the UK, see here.
International and domestic has recommenced in the UK -- see government guidance here and check the specific cruise line for regulations.
The requirement to self-isolate if you test positive for Covid-19 has been removed in England. Self-isolation is still a requirement in Scotland, Wales and Northern Ireland -- see below for more information.
Some airlines flying into England do not require passengers or crew to wear masks, but it depends on the specific route so you should check before boarding.
What's the Covid situation?
The UK has suffered considerably during Covid-19. Most recently, the Omicron coronavirus variant spread rapidly across the UK.
Cases have since fallen from the Omicron peak, but remain quite high -- and most recently appear to be rising again. There have been over 20.1 million Covid cases and more than 163,900 deaths in the UK as of March 18.
As of March 18, over 141.8 million vaccination doses have been administered in the UK and over 73.7% of the population has been fully vaccinated.
In March 2020, there was a UK-wide lockdown that lasted until the summer. Since then, England, Scotland, Wales and Northern Ireland developed their own region-specific measures -- see below for detail.
What can visitors expect?
All legal Covid restrictions -- including Omicron response "Plan B" -- have been lifted in England.
Face coverings are no longer mandatory anywhere -- they're not required on public transport. However Transport for London "strongly encourages customers to wear face coverings on its services."
London's Heathrow Airport removed its face covering mandate from March 16. In a press release, the airport said "Heathrow strongly encourages those at the airport to continue wearing a face covering -- particularly when coming into close contact with others -- although this will no longer be a firm requirement."
Venues operating with large numbers -- like theaters, concert venues and nightclubs -- no longer require proof of vaccination or proof of a negative PCR test or negative rapid lateral flow test taken within the past 48 hours.
Individual venues may still decide they wish to enforce proof of vaccination -- so it's worth checking the website of the specific venue you're visiting.
People living in England can show this proof via a "vaccine passport" called the NHS Covid Pass. NHS stands for National Health Service.
People living in England who were vaccinated abroad are also able to use the NHS Covid Pass.
International visitors may show a UK-accepted proof of vaccination to enter these venues. The UK government also advises that international visitors could register a negative rapid lateral flow or PCR test with the NHS and subsequently show an NHS text or email confirmation of a negative result.
The UK government has said it will phase out domestic use of the NHS Covid Pass from April 2022.
There are no rules on household mixing in England, and English shops, museums, theme parks, bars, pubs, hotels, B&Bs, cinemas, theaters and nightclubs are open without restrictions.
For England-based Covid guidance, see here.
Wales is currently at what the country calls Covid alert level 0.
There no limits on people meeting indoors or outdoors, in public places or private homes.
Nightclubs -- which closed following the emergence of Omicron -- are now open again.
Face masks are mandatory in certain indoor settings for people over 11 years old, including on public transport and in stores. See full Welsh face mask guidance here.
People living in Wales are no longer required to show an NHS Covid Pass to enter venues with large numbers of people, including cinemas and theaters.
Individual venues may decide they wish to enforce proof of vaccination -- so it's worth checking the website of the specific venue you're visiting.
International travelers can show a recent Covid test or a UK-accepted proof of vaccination to enter these venues.
Full details on Welsh Covid rules are available here.
Scotland recently lifted some rules that were enforced following the emergence of Omicron. There are no limits on meeting others inside or outside.
Restaurants, bars, pubs and tourist attractions are open, and Scottish nightclubs recently reopened.
Face coverings remain mandatory in indoor public places and public transport.
Proof of full vaccination or a negative Covid test is compulsory for entry to events with large numbers of people in attendance -- such as nightclubs, but not smaller venues like cinemas or theaters.
People in Scotland must show they've had a booster jab to be considered fully vaccinated if their last vaccine dose was more than four months ago.
People in Scotland are no longer legally required to use the NHS Scotland Covid Status App to confirm they're jabbed to enter certain venues.
Some businesses and venues may continue to require proof of vaccination or a recent test -- international travelers can show a recent Covid test or the same proof of vaccination that they presented at the airport to enter the UK.
All remaining legal Covid requirements in Scotland -- such as the use of face masks -- are set to be removed on March 21.
For Scotland's current Covid guidance, see here.
- Northern Ireland
Northern Ireland recently lifted its remaining Covid rules.
There are no longer limits on how many people can sit together in Northern Irish hospitality settings.
Hotels and B&Bs are open, as are nightclubs, bars, restaurants, museums and other indoor leisure and visitor attractions.
Until recently, no more than 30 people could meet in a private home in Northern Ireland for a gathering or to stay overnight. This rule has now been removed.
It is no longer a legal requirement for venues like nightclubs to ask for proof of vaccination before entering, however some venues may still require this.
People resident in Northern Ireland can use the COVIDCert NI app. International travelers can show a recent Covid test or the same proof of vaccination that they presented at the airport to enter the UK. It is no longer a legal requirement for businesses to ask for proof of vaccination or a recent test, but some venues may still require this for entry.
Face coverings continue to be required on public transport and all indoor public settings, such as museums and galleries and cinemas.
For exact guidelines, see here.
Our recent coverage
We recently got a peek inside London's abandoned Down Street station.
Planned New Year's Eve events in Edinburgh and London were canceled, due to concerns about Omicron.
Last fall, we examined the dual impact of Brexit and the pandemic on the UK tourism industry.
Check out our list of the top places to visit in the UK, or if it's England specifically you're interested, here are some of the loveliest spots in the country. You'll find our list of Scotland's top spots here.
The town of Clovelly in southwest England made our recent list of the most beautiful towns in Europe.
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