Good Morning and thankyou for your question,
It depends unfortunately.
You will be required to have a right to work in the UK before being able to join, and also will have to be from one of the commonwealth African nations, or apply for British Citizenship.
For more information, follow this link; https://apply.army.mod.uk/how-to-join/can-i-join/nationality
Hope this helps and answers your question.
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