Hi kboshir baker,
1)- Banks will sometimes require confirmation of where a customer is tax resident, especially if there are significant transactions.
This is part of compliance with international tax regulations which is what the CRS/FATCA form is for.
Your bank may be asking for this information to ensure you are compliant with these regulations.
For further information on this, you may wish to speak to your bank again to see if they can help further.
2) -If your P85 is showing as complete, it's most likely that your taxes for that period have been calculated, and no amount - overpaid or underpaid - is due.
This should be present on your Personal Tax Account, but if you would like us to confirm this, contact us by webchat or post here:
Income Tax: general enquiries
3)-It is possible that a UK employer or source of income may have had your old Dubai address set as your current address before your own update.
If your address continues to revert back to your Dubai address, contact us using the above link, and we can review your record.
Thank you.