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If you leave the UK permanently the Revenue will usually accept that you are non UK resident from the date of departure. If your departure is not permanent then you may remain UK resident for three years until your position is reassessed. In addition, if you live outside the UK for a complete tax year and do not set foot in the UK you will not be resident in the UK for that tax year.
You left the UK for Saudi Arabia on 3 Sep 2012. You have to be out of the country for a complete tax year (6 Apr 2013 to 5 Apr 2014) for your income not to be subject to UK taxation. If you leave Saudi on 3 Jul 2013 and spend the rest of the tax year to 5 Apr 2014 outside the UK then all income earned in the tax year 2013-14 would escape UK tax. Otherwise, you would be deemed resident and your worldwide income would be chargeable to UK income tax.
More information on how your residency status is treated for UK tax purposes when you leave the UK is covered in Sec 8 of HMRC6 here
HMRC has introduced Statutory Residence Test for the tax year 2013-14 onwards and the guidance notes can be downloaded from here
Your attention is drawn to examples covered in Sec 5 Split year treatment on pages 48 and onwards.
Based on dates provided by you, you would remain UK resident for tax purposes and therefore all earnings would be chargeable to UK tax. You will be entitled to your personal allowance - £9.440 for 2013-14 and £8,105 for 2012-13
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