@Jim *******
Here are the requirements for Dutch citizens. No reason why it should be different for UK citizens:
Documents required:
Passport or travel document with a validity not less than 6 months.
Visa application form (filled out)
One(1) recent 4x6cm. photograph of the applicant.
Round-trip air ticket or e-ticket (paid in full)
Proof of financial means (20,000 baht per person/40,000 baht per family)
Read: Round-trip air ticket or e-ticket -> PAID IN FULL
and from
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For UK citizens: Immigration officials in Thailand may ask you for proof of onward travel (e.g. a return or onward air ticket). You should make all reservations before travelling to Thailand. Some airlines have refused to board passengers without evidence of onward travel.
PROOF of onward travel. You need to PROOF that you are able to leave Thailand.
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PROOF of air tickets that the applicant will not overstay
That is not a print screen you made during the order process.
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Requirement for visa:
Travel booking confirmation
Again, not a printscreen you made during the order process before paying.
What they want to see is PROOF that you are able to leave Thailand.