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There is no real tax advantage to a student loan - it is basically just a non-taxable thing, so there is no advantage or disadvantage.
Generally speaking though it makes sense where you have savings to continue earning interest on that money and don't 'overpay' when repaying the debt on your student loan as the interest you will reduce it by is less than the interest you can earn on your savings.
That is correct
If you are relocating permanently then there will not be any tax deductions available to you.
The only thing that may be applicable is you might be able to be classed as a non-domicile.
Where this is the case you can opt to be taxed on the remittance basis. This means that your overseas income is not taxable if you don't remit it to the UK. However you lose your entitlement to a UK personal allowance (unless your overseas income is less than £2,000).