One extension per entry.

It would appear that you she is seeking a "Standard Visitor Visa" to enter the UK for the purposes of a holiday.

According to the government website you can apply online on her behalf if they cannot apply for themselves.

1. The earliest you can apply is 3 months prior to departure.

2. Cost £115 for a standard visotr visa which permits a maximum stay of up to 6 months.

3. She will need to supply biometrics at the visa application center.

4. Proof is required to show that she will rerun n to Thailand e.g. employment, house, car or children etc

5. Evidence that she can support herself during her stay in the UK such as bank statements, payslips on so on or evidence from her sponsor which in this case will be you. You/her will need to detail what that financial support looks like i.e. you have sufficient funds (the website does not detail what 'sufficient' means in a figure sum. Detail your relationship, marriage certificate for example, perhaps emails or other correspondence you've shared. Your status as a UK citizen - copy of passport.

6. Return ticket.

7. Passport valid for the duration of her stay.

8. Outline an itinerary of her stay even if it's as simple as visiting your family.

There's no need for an agent to when you can do it by yourself for free.

I don't know about this particular bank, but I have kbank and use their banking app to scan + pay.

Yes, it's 800,000B each, not 80,000B in a Thai bank account which permits instant access.

@Andy *********

my comment refers to a forum related to a variety of issues for Thai/UK couples such as visa applications, life in the UK test, financial requirements and so on. It has nothing to do with an agent site, also I'd never recommend using an agent.

@Andy *********

not much different than here then.

Have a look at this free online community. There is plenty of great advice and many people going the same process as yourself.

There's a search feature at the top of the page. This question is asked so often there should be a few hits.

In a city of 11+ million people where do you mean "in Bangkok"?

Exchange places outside of the airport are mostly the same. Unless you're changing a huge sums in which case you won't be using a "street" exchange it doesn't matter.

B) you asked the same/similar question back in November - it hasn't changed.

@Steve ******

thanks for the great advice it's most welcome!!