Thanks for requesting me.
I shall assume that you are not married to a UK national.
You will see that the standard requirements for naturalisation are contained here, on the following UKBA webpage:
You will note that you must have been resident in the UK for 5 years prior to making the application. Therefore the earliest that you could possibly make the application would be 15th May 2014.
The current amount of time that you have spent outside the UK will not be a problem.
However, your plans to work outside the UK for a period of 9 months will be a problem.
You will note on the above link that you must not spend more than 90 days outside the UK in any 12 month period during your 5 year residence period.
So, if you were to planning to apply as soon as you have reached your 5 year period then you would not be able to work outside of the UK for more than 90 days before you apply. So, I am afraid that you will have to either alter your plan to work outside of the UK, or work outside of the UK and then wait the best part of a year before applying for naturalisation.
You must also make the application from within the UK.
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