Hi-La-Ri-Ous

So I just checked and my SSN should arrive within 2-3 weeks of landing in the US.

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I have 30 days to get my driver’s licence in Washington State.

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I need either an SSN or ‘proof of ID’ – a multi-stage, minimum 2 week process – which involves presenting proof of address twice and waiting for a form to arrive in the mail.

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I’m not sure that it’s actually possible for me to get a driver’s licence in Washington State before I’m not meant to use the UK one anymore. Anyone got any great ideas?