Do I need to apply for UTR?

Hi, I'm just arriving UK so don't have unique tax reference number (UTR) now. I'm going to be UK tax resident 23/24 and onward, I do have oversea income that potentially taxable in the UK, but do not have any UK source income (not own business, not under employment nor self-employed) Do I need to register for self-assessment and obtain a UTR? Thanks

Hi al1918 YU,
As a UK resident with overseas income, yes, you should register for Self Assessment and obtain a UTR.                                    
 Check if you need to send a Self Assessment tax return
 Tax on foreign income         
Thank you.