Vaccine certificates could be introduced in Britain as a way out of the coronavirus lockdown, opening up a path to normality.
But Prime Minister Boris Johnson on Thursday said there could be harmful side effects to a document that allows people with Covid protection access to restaurants or live music venues.
Some managers in the hospitality industry also have concerns.
Mr Johnson said there were “moral complexities” to consider as some people were unable to take a vaccine for health reasons.
He said it might only be possible to introduce the plan after all adults have been offered the vaccine, and that it would not be in place for April 12, when pubs have been scheduled to reopen with limits.
"There are three basic components: there's the vaccine, there's your immunity you might have had after you've had Covid, and there's testing," Mr Johnson said.
"They are three things that could work together.
"No decisions have been taken at all. One thing I will make clear is none of this is obviously going to apply on April 12, when it will all be outdoors anyway."
Mr Johnson spoke a few hours before the UK Parliament extended lockdown powers by six months.
"There are some people who, for medical reasons, can't get a vaccination," he said. "Pregnant women can't get a vaccination at the moment. You've got to be careful about how you do this.
"You might only be able to implement a thoroughgoing vaccination passport scheme, even if you wanted such a thing, in the context of when absolutely everybody had been offered a vaccine."
Patrick Dardis, chief executive of the Young's pub chain, said vaccine passports would be "unworkable".
Greene King, the City Pub Group and Shepherd Neame chains have also opposed the plan.
"It's absolutely fine to exclude people where there is a situation of bad behaviour or drunkenness, and that's already enshrined in law,” said Shepherd Neame chief executive Jonathan Neame.
"But if you're going to exclude people for what they are, or what they have not done, that's a wholly different issue that does touch on discrimination, civil liberties and in this case data protection issues."
The emergency powers bill passed by 484 votes to 76 with the backing of the opposition Labour party, although 40 Conservative MPs voted against it.
Throughout the pandemic, a libertarian caucus within the ruling Tory party has objected to restrictions to mitigate the spread of the virus, saying it led to loss of freedom and creeping authoritarianism.
Many also worry about the staggering economic cost of lockdowns.
As things stand, the UK's road map to normality is unaffected by the legislation, and emergency powers will only be enacted should the pandemic significantly worsen in the months up to September, when the extension expires.
Tips for taking the metro
- set out well ahead of time
- make sure you have at least Dh15 on you Nol card, as there could be big queues for top-up machines
- enter the right cabin. The train may be too busy to move between carriages once you're on
- don't carry too much luggage and tuck it under a seat to make room for fellow passengers
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FIXTURES
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Super heroes
Iron Man
Reduced risk of dementia
Alcohol consumption could be an issue
Hulk
Cardiac disease, stroke and dementia from high heart rate
Spider-Man
Agility reduces risk of falls
Increased risk of obesity and mental health issues
Black Panther
Vegetarian diet reduces obesity
Unknown risks of potion drinking
Black Widow
Childhood traumas increase risk of mental illnesses
Thor
He's a god
ACC 2019: The winners in full
Best Actress Maha Alemi, Sofia
Best Actor Mohamed Dhrif, Weldi
Best Screenplay Meryem Benm’Barek, Sofia
Best Documentary Of Fathers and Sons by Talal Derki
Best Film Yomeddine by Abu Bakr Shawky
Best Director Nadine Labaki, Capernaum
Specs
Engine: Electric motor generating 54.2kWh (Cooper SE and Aceman SE), 64.6kW (Countryman All4 SE)
Power: 218hp (Cooper and Aceman), 313hp (Countryman)
Torque: 330Nm (Cooper and Aceman), 494Nm (Countryman)
On sale: Now
Price: From Dh158,000 (Cooper), Dh168,000 (Aceman), Dh190,000 (Countryman)
COMPANY PROFILE
Name: Kumulus Water
Started: 2021
Founders: Iheb Triki and Mohamed Ali Abid
Based: Tunisia
Sector: Water technology
Number of staff: 22
Investment raised: $4 million
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SERIES INFO
Cricket World Cup League Two
Nepal, Oman, United States tri-series
Tribhuvan University, Kathmandu
Fixtures
Wednesday February 5, Oman v Nepal
Thursday, February 6, Oman v United States
Saturday, February 8, United States v Nepal
Sunday, February 9, Oman v Nepal
Tuesday, February 11, Oman v United States
Wednesday, February 12, United States v Nepal
Table
The top three sides advance to the 2022 World Cup Qualifier.
The bottom four sides are relegated to the 2022 World Cup playoff
1 United States 8 6 2 0 0 12 0.412
2 Scotland 8 4 3 0 1 9 0.139
3 Namibia 7 4 3 0 0 8 0.008
4 Oman 6 4 2 0 0 8 -0.139
5 UAE 7 3 3 0 1 7 -0.004
6 Nepal 0 0 0 0 0 0 0
7 PNG 8 0 8 0 0 0 -0.458