Hello Robert, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
The moneys earned in the Middle East would not, even if you were an UK citizen and had gone through the correct procedure on departure, be liable to UK taxation. There is no risk that any transfer of funds to your UK bank account (check with the bank that the account is still active) will be subject to UK taxation. If the sum to be transferred is substantial you should warn the bank of incoming funds and their source to head off any money laundering inquiries a large tranche attract.
I do hope that I have been able to set your mind at rest on this matter.
It is always a good idea to make the transfer before you leave the Middle East. It removes any taxation queries, that is why ex pats do it. It is what I always recommend. If you are registered as non resident you may spend up to 91 days in any one tax year without infringing your status.
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