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Visit Visa (Tourist Visa) Bear in mind a Visitor visa refusal can not be appealed. Look at ThaiVisa.Com for detailed information from people who have gone thru the same Visa process.
1, Write letter inviting girlfriend to UK and say you will be her sponsor and confirm you will pay for all expenses during her stay. Include her and your most recent bank statement or balance.
2, Include any evidence that she has close family ties in Thailand. Mom dad example.
3, Provide evidence of you sending or giving money to her.
Good luck
Upvote:3
what to declare as the purpose of the trip - tourist, visiting friend, visiting family or business (we will be visiting friends and family on this trip)?
The application should be filled out according to the applicant's perspective, so she would enter "tourist" as the purpose of her trip. "Family" is taken to mean the applicant's family, and the same for business unless she is accompanying you for a social function related to your business. Based upon what you wrote, the screen should look like this...
what information to provide to avoid any possibility of being suspected of not returning at the end of the trip?
Bear in mind that it is her application, not yours and they are likely to discard evidence that you provide that is irrelevant to her circumstances. She should study the guidance and provide the things that she is able to. Since she does not work and has no credit she would be assessed in a higher risk category. Evidence of travel to the USA is quite strong however (along with Singapore), and this should be included. She should include an itinerary like the form asks for. She will need to disclose and explain her prior refusal from Canada.
will a copy of the credit card statement with the available limit qualify as adequate funds?
No, credit card statements are not proof of capacity, they do not show the regular movement of funds and more importantly they do not show that the funds have been lawfully obtained.
as I will be sponsoring the trip and am also her principal source of income, what information should I provide about my personal circumstances?
You can prepare a letter explaining your relationship and why you are sponsoring her. You should then include your employment contract, 3 - 6 months of bank statements (with irregular movements documented), evidence of your living arrangement in Thailand, and a photograph or two showing the relationship is subsisting. Plane tickets and hotel reservations are not required.
Sponsorship, when supported by evidence of a subsisting relationship, will allow her to clear the finance and accommodation hurdles. Prior travel to the USA will mitigate some, but not all of the flight risk associated with Thai nationals.
In addition to the guidance, it makes sense to study Appendix V of the rules. You can also have a look at this answer posted earlier this year.
I don't want a refusal or a drawn out back and forth process.
There will not be a drawn-out back-and-forth process, if your friend does not qualify on what they have she will be refused; do not expect them to call and ask for more stuff. The British Consulate General in Bangkok will turn applications around in 10 days normally or 15 days max.
Note: Avoid the appearance of 'owning' the application.