Hi Robert Simpson,
As you are not UK resident, it is unlikely that a Self Assessment tax return is required.
Your individual circumstances would determine this.
Please go through the Self Assessment criteria tool to determine if a tax return is required.
Check if you need to send a Self Assessment tax return.
As a non UK tax resident, HMRC is only concerned with your UK sources of income and capital gains, so anything arising outside the UK would not be taxable and not declared in the UK.
Thank you.