What documents are needed for my girlfriend's Soft Power visa application for a Thai cooking course?

I’ve recently been granted my Workcation (DTV) visa for Thailand through the Royal Thai Embassy in London. I’m now preparing to apply for a Soft Power visa for my girlfriend, who will be enrolling in a certified Thai cooking course during our stay.

What we’ve done so far:

• Transferred 500,000 THB into her personal Thai bank account last week to support her application.

• Secured her official enrollment in a six-month Thai cooking program.

• Drafted a sponsor letter confirming that both I and my company will cover her accommodation, utilities, and living expenses, as we will be living together in Thailand.

Additionally, she will be assisting me on the side with administrative and creative tasks for my company, which is registered in the United Kingdom and operates entirely outside of Thailand. This will serve as a supplementary, remote source of income.

I’d appreciate clarification on the following:

1. Should the 500,000 THB remain in her account for a specific duration before applying (i.e. seasoning)?

Some sources mention a 3-month history—can you confirm the requirement for the London embassy?

2. What exact documents are required from the Thai cooking school?

Is the acceptance letter sufficient, or do you also require the school’s business registration, class schedule, or payment receipt?

3. Is proof of relationship needed, and if so, what type is preferred?

Would personal photos, joint travel history, or a signed affidavit be appropriate?

4. Should we include a copy of our rental agreement in Thailand?

Will this help demonstrate shared accommodation and support her application?

5. Would you recommend including my employment contract, company registration, or income statements to reinforce the sponsor letter?

Documents we’re preparing to submit:

• Sponsor letter (detailing financial support and cohabitation)

• Thai bank statement showing 500,000 THB deposit

• Enrollment letter and payment confirmation from the cooking school

• Proof of accommodation (lease/rental agreement)

• Proof of relationship (photos, travel itinerary, joint documents)

• My employment and business documents (as financial sponsor)

• Explanation of her remote assistance with my UK-based business (non-Thai income)

Please let us know if there are any other requirements specific to the Royal Thai Embassy in London, or if there’s anything else we should include to ensure a smooth and successful application.