To many visits on a tourist visa close to each other. Seems your trying to border hop but flying back and from your own country. Dates are to close to each other and many times . Red flag
Galenus Gold not if its been taxed already. Show proof of tax . Get a Thai TIN registration then proof of tax if any of the income you have sent ie from pension or savings. If you send savings or any other form of money that hasn't been taxed already then yes
Anything you pay tax on in the UK in non taxable in Thailand as you have already paid tax on it. If you have any income that hasn't been taxed on in the UK including savings you pay tax in Thailand if you have been in the country for more than 180 days
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