@David ******
It is rare that I have used my card actually in Thailand as I usually take UK cash & exchange it at TT Exchange for baht but I took the gist of the question to be :- Was it possible to get Thai money from a bank with a UK credit or debit card.
Going back quite a lot of years, I remember there was no charge from any of the ATM's, & you could usually get upto around 10,000 bht a time, but as time went on charges were brought in with the Krungsai Bank being the last bank to impose this.
If any of the above is info is incorrect, I would like to be corrected.