FILE - In this Wednesday, Nov. 4, 2020 file photo, a waiter wears a face mask as people eat and drink outside restaurants in Soho, in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Alberto Pezzali, File)

Britain's Prime Minister Boris Johnson attends a media briefing in Downing Street, London, Monday, June 14, 2021. Johnson has confirmed that the next planned relaxation of coronavirus restrictions in England will be delayed by four weeks until July 19 as a result of the spread of the delta variant. In a press briefing Monday, Johnson said he is “confident that we won’t need more than four weeks” as millions more people get fully vaccinated against the virus, which could save thousands of lives. (Jonathan Buckmaster/Pool Photo via AP)

Britain's Prime Minister Boris Johnson walks to 10 Downing Street after his press conference, in London, Monday, June 14, 2021. Johnson has confirmed that the next planned relaxation of coronavirus restrictions in England will be delayed by four weeks until July 19 as a result of the spread of the delta variant. In a press briefing Monday, Johnson said he is “confident that we won’t need more than four weeks” as millions more people get fully vaccinated against the virus, which could save thousands of lives. (AP Photo/Alberto Pezzali)

FILE - In this Monday, April 12, 2021 file photo, a customer holding his dog orders outside a restaurant in Liverpool, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo Jon Super, File)

A couple wear face masks as they shelter from the sun under an umbrella, while they walk in Covent Garden, in London, Monday, June 14, 2021. British Prime Minister Boris Johnson is expected to confirm Monday that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Alberto Pezzali)

From left, Chief Medical Officer Professor Chris Whitty, Prime Minister Boris Johnson and Chief scientific adviser Sir Patrick Vallance attend a media briefing in Downing Street, London, Monday, June 14, 2021. Johnson has confirmed that the next planned relaxation of coronavirus restrictions in England will be delayed by four weeks until July 19 as a result of the spread of the delta variant. In a press briefing Monday, Johnson said he is “confident that we won’t need more than four weeks” as millions more people get fully vaccinated against the virus, which could save thousands of lives. (Jonathan Buckmaster/Pool Photo via AP)

People sit at outside tables in Covent Garden, London, Monday, June 14, 2021. British Prime Minister Boris Johnson is expected to confirm Monday that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Alberto Pezzali)

FILE - In this Saturday, Feb. 13, 2021 file photo, Britain's Prime Minister Boris Johnson, wearing a face mask to prevent the spread of the coronavirus, visits a PPE manufacturing facility during a visit to the north east of England, in Seaton Delaval, England. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Scott Heppell, Pool, File)

FILE - In this Monday, April 12, 2021 file photo, a waitress serves drinks at a cafe in the Soho area of London, as restaurants, bars and pubs can open and serve people who can be seated outside. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Alastair Grant, File)

FILE - In this Tuesday, March 3, 2020 file photo, Britain's Prime Minister Boris Johnson reacts during a press conference at Downing Street on the government's coronavirus action plan in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Frank Augstein, Pool, File)

FILE - In this Tuesday, March 24, 2020 file photo, two people wearing masks stand at the top of a bank of escalators in London's Waterloo Station. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Matt Dunham, File)

FILE - In this Monday, April 12, 2021 file photo, people carry shopping bags while others queue to enter a store on Oxford Street in London. British Prime Minister Boris Johnson is expected to confirm Monday June 14, 2021, that the next planned relaxation of coronavirus restrictions in England will be delayed as a result of the spread of the delta variant first identified in India. (AP Photo/Kirsty Wigglesworth, File)

Britain's Prime Minister Boris Johnson walks to 10 Downing Street after his press conference, in London, Monday, June 14, 2021. Johnson has confirmed that the next planned relaxation of coronavirus restrictions in England will be delayed by four weeks until July 19 as a result of the spread of the delta variant. In a press briefing Monday, Johnson said he is “confident that we won’t need more than four weeks” as millions more people get fully vaccinated against the virus, which could save thousands of lives. (AP Photo/Alberto Pezzali)