Hi Team , This is my first yea in UK and i registered self-assessment on 16 Sept 2022. I wait for more than 10 working days and did not receive the UTR number and therefore i registered self-assessment once again on 04 Oct 2022. I received the letter from HMRC on 10 Oct and 12 Oct respectively and now i got 2 UTR number on hand. Can i delete 1 of the UTR number ?? or which UTR number i should use for my tax return purposes ? Thanks.