Bangkok Bank London is not a retail bank, but maybe its possible to use them th facilities a uk thailand transfer. Presumably from Bangkok bank london to Bangkok is an intrabank transfer.
Buriram is not an international airport. BKK has the veterinary receiving facilities, but after that, the animal can go on any domestic flight, in the hold.
Looks like David Cameron is doing the right thing. UK and Thailand are now in discussion about bilaterally waiving visa requirements, probably for holiday visits. Its just the start of a discussion, and Lord Cameron may no longer be in government by the time they conclude. The intent is there from both sides.
Cars are expensive to buy. 100,000 Bht gets you pretty much a wreck, or a Fiesta with an autobox about to fail (no one wants them! 170,000 for new clutch!). Yes, my car in Thailand is a 2014 Fiesta, 90,000 bht with 80k kms on it, and a roof full of filler. Wife chose it against my better wishes, because it belonged to a friend etc etc. Rentals from Buriram airport are about 700 a day for something like a Yaris. Rentals which are not new (1-2 years old) are cheaper. Get a Thai person to sort it out. My wife sorted out a rental when we spent a week in Sikhoraphum. Rental lady picked us up from the airport, didn't even want to see my licence, so I'm sure insurance was iffy, but it was a brand new car. Roads are good (but there is construction going on), but most of the rental cars have tinted film on the glass, making it terrible at night. Lot of drunk drivers.
Unlike the banks, Nationwide don't seem to need high deposits, nor a £75k salary. But they might have requirements in terms of how long you have been with them.