losing an account is not the same as losing money. I would rather send money via a FCA authorised exchange than a bank any day and save a few grand. Banks offer protection if they go bust but you would have to be extremely unlucky for that to happen in the few days they send your money to Thailand.
yes but banks give bad rates. If you sent 75k for example you'd lose about 1.5k on the exchange rate compared to a specialist currency exchange/sending service.