Confusion still prevails, as lack of certainty in respect to TRD's actiial custom and practice, for the tax filing season in the next 3 months.
Taxable income from the UK, generated whilst you were tax resident in Thailand, is potentially taxable for the proportion brought into Thailand;- in the same year pre 2023, any time from 2024 onwards ( but with por 162 exemption for pre 2024, remitted later.
Any interest, post 2023, from pre 2023 savings, is taxable, for a Thai Tax resident, when it is remitted to Thailand, 2024 on.
Very simplified answer, to a very simplified question, and also generalised. ( remembering capital gains are taxed as income in Thailand etc etc)
Read the guide....but every thing is a probability, rather than an absolute me thinks. Actual reports soon maybe.