Eight teenagers have tested positive for coronavirus following holidays to the Greek island of Crete.
The teens tested positive after arriving back in the UK on Wizz Air's flight 8168 from Heraklion to Luton Airport on August 25.
Budget airline Wizz Air stated that the relevant health authorities "have been informed" following the positive Covid-19 virus results.
The eight teens involved were part of a group of 12 who visited the Greek island for ten days.
Those affected have been ordered to self isolate by the Department of Health and Social Care.
The group had been unaware they had contracted the virus, but were alerted to the fact when friends from Estonia they had made in Crete had revealed they had tested positive for the virus when they had returned to their homes in eastern Europe.
The group of UK based teens live in Winchester, Hampshire.
The BBC reports that the teens went to a testing centre at a local drive-through centre.
A father of one of the teenagers, who is 18, told the outlet that his family had not been contacted by the NHS test-and-trace system.
The concerned dad explained that he had taken the step to self-isolate as a family as a consequence of his son's positive test result.
He said: "We've simply had to rely on the much vaunted British common sense and do things on our own without any help from the authorities, and what we're doing obviously is self-isolating.
"The track-and-trace system doesn't have to be world beating, it just has to work, and it clearly doesn't at the moment."
The Department of Health and Social Care has defended the UK's current test-and-trace system.
A spokesperson said: "Hundreds of thousands of people are being tested every day and to make sure we stay in control of this virus, we are targeting our testing capacity at the areas that need it most, including those where there is an outbreak as well as prioritising at-risk groups."
While Wizz Air has said: "The airline has now informed the relevant health authorities in England who are responsible for contacting and advising the 204 other passengers who were on board the flight.
"Wizz Air operates all flights in compliance with local travel regulations, and the safety of passengers and staff is the number one priority."