No, you shouldn't have anything to worry about, possibly 'fraud' on address, etc and exchange, but that's unlikely, just inform HMRC you are tax resident in Thailand (where you live). and Thai tax law allows you to operate in the UK tax free as long as you don't bring to thailand till new tax year, though that opens up possible tax in the UK.
In future use offshore exchanges, and move the funds to uk bank and from there︀ to thailand if need to, by offshore i mean ones that use 3rd party payment︁ movers so it's not coming directly from an exchange - saves a lot of confusion.︂