What content must be included on my paperworks for a multi entry 1 year business prospection visa to be submitted to online visa application?

- Invitation letter from thailand partner company content must include what information?

- paperwork from the company sending me on the mission must include what information and letters?

Thanks in advance

Good morning everyone i plan to bring my partner from thailand to england for a holiday nect year

Whats the best option for applying for a visitor visa, i believe my partner has to make the application?

Also in my letter of invitation what needs to be included and are there other requirements needed to assist in the application ? Tia

I’m currently in the process of applying for my SEV from the uk, staying at my girlfriends condo in Bangkok. She has to write an invitation on one of the sections, is there anything specific that she needs to include? Thanks