UK Visa Renewal

Hi Guys, Im a bit confused. Can somebody please do help me if you are familiar with the visa processing rules in uk. I do have an existing UK visa that will expired on Nov 2016 and i am planning to go back jan of 2017. The question is Can i already apply as soon as my visa expired or should i take 1 year before i apply for another visa. Because they say i can only stay in UK 6months on 12months period.

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