Easier simply to apply for a standard visitor visa. Being married is a plus, but you need to show she has more reason to return to Thailand than to stay in UK. I got my partner a standard visitor visa (6 months) first time. She is now coming to the end of her 2 year visitor visa and will apply for either a 5 year or 10nhear visitor visa next time. Makes things so much easier coming and going at will rather than waiting on a decision each and every time
Bangkok Bank will open an account for a tourist on a tourist visa. Not sure about visa exempt as the bank stated there needed to be 30 days remaining on visa. Technically when you arrive visa exempt you would only have 29 days remaining.
it be whatever immigration office serves the area where your are staying. You will receive an entry stamp allowing you to stay for 30 days, then you go to your local immigration and extend for another 30 days and get that stamp. Then you'll have to leave.