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Can an American green card be transferred to the UK now?

Can't leave the country directly.

According to Baidu Encyclopedia, holding an American green card can avoid connecting with DATV, but you must have a valid connecting ticket and cannot leave the airport. If you want to enter the country, you need to apply for an American visa in advance.

TRANSITVISA is a direct transit visa for the British airport quarantine area. A valid Canadian, New Zealand, Australian or American visa is required for application.