如持有有效的BN(O) 簽證，您不需等到有 National Insurance (N.I) number 也可以工作。以下是一封來自內政部的信，用於證明您有權在英國工作、生活和讀書。如果雇主或業主懷疑您BN(O)的身份，您何用這封信去證明。

You don't need to wait for your National Insurance number before starting work, if you have a valid BN(O) visa. This is a letter from Home Office to prove you have the right to work and live in the UK. You can show this letter to your employer or landlord about your rights in the UK. 

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https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1057937/220217_To_Whom_it_may_concern_-_English.pdf