Airline officials say Britain has revoked the visas of Thailand's ousted Prime Minister Thaksin Shinawatra and his wife Pojanan.
British officials would not comment, but media reports Saturday said the British Embassy in Bangkok sent an e-mail to airlines advising them not to transport the couple to Britain from any port.
Thaksin, ousted in a 2006 military coup, jumped bail in early August and fled to Britain, where he has been living in exile. He has since been sentenced in absentia to two years in prison for corruption.
Thai prosecutors have said they would seek Thaksin's extradition.
The former Thai leader's whereabouts are unknown, but media reports say he is traveling in China.
Some information for this report was provided by AFP and AP.