People walk through the archway of Horse Guards Parade in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

The "London Eye" and Westminster Pier are seen quiet in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

The sculptural group of Boadicea and Her Daughters is seen surrounded by the "London Eye" in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A man wearing a face mask cycles in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A man wearing a face mask cycles in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A passenger walks past a notice saying face covering should be used while travelling in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Medics from London Ambulance take part in the weekly "Clap for our Carers" for the last time in front of St. Thomas Hospital in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A woman wearing a face mask takes part in the weekly "Clap for our Carers" for the last time in front of the Houses of Parliament in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Photo taken on May 28, 2020 shows a quiet Buckingham Palace in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A woman wearing a face mask is seen by the River Thames in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

People wearing face masks walk through the archway of Horse Guards Parade in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A woman cycles in front of the Houses of Parliament in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

A woman wearing a face mask walks past the statue of Winston Churchill in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Police vans are seen in front of the Houses of Parliament in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

People take part in the weekly "Clap for our Carers" for the last time in front of St. Thomas Hospital in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Photo taken on May 28, 2020 shows a quiet Buckingham Palace (R) and Queen Victoria Memorial in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Passengers walk past a notice saying face covering should be used while travelling in London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

Photo taken on May 28, 2020 shows the Houses of Parliament in central London, Britain. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)

People pass by the statue of Winston Churchill in central London, Britain, on May 28, 2020. British Prime Minister Boris Johnson on Thursday unveiled some "limited" and "cautious" easing of the country's coronavirus lockdown measures. (Xinhua/Han Yan)