The UK government is considering imposing quarantine on arrivals from Greece, after several clusters of cases linked to the island of Zante.
Scotland and Wales have already introduced measures for people returning from Greece.
And travel company TUI has cancelled holidays to a party resort on Zante, saying customers there are not following coronavirus safety advice.
The UK is also considering whether to remove Portugal from its quarantine exemption list - after a rise in cases there.
Travel editor of the Independent Simon Calder says officials may be over-reacting.
IN: "There's nothing...
OUT: ...decline."
DUR: 26 seconds