I am from an Asian country and I have an existing UK visa that will expire on November 30, 2016. I've visited the UK twice. July-August 2016 for 3 weeks and October for 2 weeks and I am planning to go back to the UK again.
My question is: Can I apply for a UK visa as soon as my existing visa expires? Or do I need to wait for another year since they say that you are only given a 6 months visa in a year?