Well done. I did the same a few weeks ago, just needed a certificate of residence. The banks don’t tell you this just say ‘no bank account with DTV because they cannot be arsed to help’.
Having the correct paperwork opens doors.
Go to IO and get a cert of residence and the banks won’t refuse especially as the IO insists on providing a letter to your nominated bank stating that you are a resident
Not strictly true, see my comment above. All you need is a proof of residence, both the bank and immigration confirmed that to me ahead of me getting my bank account last week with no questions asked at the bank when providing the correct paperwork