People depart from Terminal 5 of Heathrow Airport in London, Britain on June 8, 2020. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

A man walks through the arrivals lounge of Terminal 5 of Heathrow Airport in London, Britain on June 8, 2020. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

Photo taken on June 8, 2020 shows a plane of British Airways landing at Heathrow Airport in London, Britain. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

Photo taken on June 8, 2020 shows a sign inside the arrivals area of Terminal 2 of Heathrow Airport in London, Britain. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

People queue outside Terminal 5 of Heathrow Airport in London, Britain on June 8, 2020. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

Photo taken on June 8, 2020 shows a plane taking off from Heathrow Airport in London, Britain. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

People queue outside Terminal 5 of Heathrow Airport in London, Britain on June 8, 2020. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)

Photo taken on June 8, 2020 shows a sign outside Terminal 2 of Heathrow Airport in London, Britain. People arriving in Britain by any means, including air and sea, have to go into self-isolation from June 8 at a designated address for 14 days as a condition of being allowed through frontier posts, Home Secretary Priti Patel told MPs on June 3. (Photo by Tim Ireland/Xinhua)