UK Immigration Law
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It's not a problem in the sense that you will be able to return to the UK after being in Pakistan for that time because you still have a valid visa.
Note though that this period will impact on your residential qualifying period for your to make an application to stay here permanently, which means that you may have to apply for further leave to remain when your visa does expire so that you meet the requisite period in order to apply for what will be called earned citizenship when the new rules come in next year.
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