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1.The visa application must be lodged in the country where you currently reside. Note: this does not have to be your country of origin.
2. Your immigration status will stay the same while you wait for your new visa if you make the application in the 28 days before your visa ends. You’ll still have the right to work, access education and receive benefits while you wait for a new visa. Once you’ve applied you can stay in the UK until you’ve been given a decision, as long as you applied before your last visa expired.
3.No you will not have any issue if you return subsequently in a different category to sort out your matters.