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This isn't true. I knew someone that lived illegally in the UK for almost a decade.

They could only get terrible restaurant jobs that didn't report anything to the government and were visited by immigration multiple times.

Even after getting an immigration lawyer couldn't help with citizenship.

What finally worked was having a kid and marrying a citizen.

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What do you mean? Any major employer in the UK will need more than that for you to work there.
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Yes my friend moved from Sydney to London for work and he said it was a nightmare. He had his job in London lined up but he needed a UK bank account. He couldn’t get a bank account until he had a UK residence. His apartment lease needed his proof of employment.

He had to use his friend’s address for the bank account and then changed it.

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I also moved from Sydney to Britain and just paid my rent from my Australian bank account until I got my British bank account. Your friend may not have thought to do this because he probably expected the ‘prison guard LARP’ attitude that Australian real estate agents have to also exist here in Britain.
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So only a few times in many years, I think most need an NI number only
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that's... really abd
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