Apart from the short term effect of killing off Virgin Atlantic, these restrictions will cause enormous damage to the rest of the UK air transport industry. The quarantine restriction seems to be aimed at stopping the virus being 'seeded' again by asymptomatic people arriving from other countries. Logically it will have to be applied until a mass vaccination programme has been completed, even if no new cases have been reported in the UK for several weeks. If an effective vaccine is not found, what then?