Normal for Thai wife visa. Best just put the amount in an account and forget about it. Then it’s available to show immigration every year without worry regards any time periods etc.
Fly to France then take a small boat across the channel to the uk. On arrival not only will you get free accommodation but also an allowance and free mobile phone.
So where have you been staying during your time in pattaya? Obviously do not want immigration to know if a one day stay at a hotel is so important for your tm30.
many pass via France where the immigration officials hand out documents to them explaining how to get to the uk, and what they can claim when they get there. And then probably escort them to the beach and wave them off with a big smile!
A major factor in issuing a visa is the persons work history, wage and someone of importance who will act as a guarantor. If her work is not an approved profession then forget it.