Right now, if I SEND Bht 40,000 from my GBP balance, which I just transferred from my other UK bank, it would cost me £890.57 plus £5.61 fee = £896.18, with no fee at this end.
If I CONVERT Bht 40,000 from my GBP to my THB account, and then send it to Bkk Bank, it would cost me £890.47 plus £4.90 conversion fee, plus Bht 31.60 at this end. Exchange rate is the same at Bht 44.91.
Not really worth worrying about.