Have you tried contacting a Royal Thai consulate in UK for advice? Address: Royal Thai Honorary Consulate, Cardiff
71 Rhydypenau Road
Cyncoed Cardiff CF23 6PZ
Tel: +44 (0) 2920
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Mobile +44 (0) 7966
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Email:
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Royal Thai Honorary Consulate, Hull
Address: Royal Thai Consulate, Hull
Sands Lane, Elloughton Brough HU15 1JH
Tel: +44 (0) 7983
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Email:
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This used to be quite the workaround - maybe Hull but also maybe the old Birmingham address. Whatever you are likely to get a more caring, more constructive approach than from the London Embassy. BTW isn't it the case that the London Embassy can now only be visited by appointment???