Holidaymakers can travel abroad without "looking over their shoulders" in fear of being caught out by changing rules, Transport Secretary Grant Shapps has claimed.
Restrictions are being eased or limited for people arriving in England, Scotland and Northern Ireland from several countries from 4am on Sunday.
Fully-vaccinated travellers will be exempt from quarantine when returning from France, Spain has kept its place on the amber list, and India is among four countries being removed from the red list.
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Seven nations will be added to the quarantine-free green list, including Germany, Austria and Norway.
Mr Shapps said the rollout of vaccinations in the UK and overseas means changes to the travel lists are being made every three weeks, compared with once a week last summer.
He told BBC Radio 4's Today programme: "I hope people will be able to go away under this simplified system, enjoy their breaks and not be looking over their shoulders the whole time."
However, most countries have strict isolation requirements in place for those who return a positive test, reports the Mirror.
While some nations allow tourists to quarantine at home, others put visitors in special hotels, sometimes at the visitor's cost.
Spain
If you develop Covid symptoms while in Spain you must begin isolating and contact the health authorities in the region you're in.
After taking a test if the results are positive, then you'll have to isolate for 10 days.
In the Valencia region, hotels have set up self-isolation rooms for tourists who develop Covid-19 to stay in, so there is always accommodation available for them to lengthen their stay.
Tourists have to pay for the accommodation and face a £25,000 fine if quarantine is breached.
Italy
After contacting the local health authority, those who test positive need to isolate for 10 days, according to Italy's national government.
If you continue to test positive, then that may be extended to 21 days.
Regional governments are able to enforce different rules.
According to media reports, groups of French tourists in Sicily have been confined to Covid hotels for 21 days after testing positive on the island.
France
Official government advice is that if you have the virus, you must-self isolate for 10 days from the date of your first symptoms.
If you still have a temperature at the end of those 10 days, you must continue to self-isolate for a further 48 hours.
Portugal
Portugal's isolation periods are maxed out at two weeks.
Those who test positive while in Portugal have to quarantine at home or a hotel for a period of 10 to 14 days.
A negative test must be produced when later leaving the country.
Greece
If you are tested and the result is positive, the Greek authorities will ask you to quarantine until advised otherwise.
You may be able to remain in your existing accommodation or be required to transfer into a state hospital or other government-provided accommodation.
Many Brits have found themselves in quarantine hotels paid for by the Greek state.
An initial period of 10 days that is required for those who come into contact with an infected person, as well as those with the disease, can be extended by 14 days if they later catch the virus.
Germany
A positive test in Germany will see you spend 10 days in "suitable accommodation", whether that be a friend's home or a hotel.
Those caught breaching the rules could end up paying £8,500.
Malta
Malta operates a similar system to Greece, where visitors have to quarantine in a government-approved hotel.
Four Spanish students recently found themselves in this position, despite only coming into contact with an infectious person.
They had to pay almost £2,000 for the 10 day experience.
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