Thank you for your question..
If you return to the UK to take up permanent residency here before 6 Apr 2017 (in the current tax year), your income prior to date of arrival would not be chargeable to UK income tax. Your income/earnings once you are here would be within the scope of income tax as you would become UK resident for tax purposes.
More information on Split year treatment can be found on pages 51 onwards of RDR3 here
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