Wasn't aware there was a loophole!
What I've done in the past (I'm on a retirement "visa"), is transfer money every few years, as and when I need it, using "personal expenses" on the transfer form, as the reason for bringing the money over, which is the reason for doing so. If memory serves me correctly using "personal expenses", means the money isn't taxed on entry here.
No one has mentioned that the UK & Thai Governments have a tax agreement, where if one pays UK tax, then one doesn't pay tax in Thailand, and presumably vice versa. I pay tax on savings in the UK, so as far as I'm aware, I'm not liable for tax here.I did claim arebate here once, many years ago, but haven't since. I also pay tax on my savings in Thailand.