Travel Help ,Urgent???

Hey all the Travel Guru's out there...I wanted to know that if i am Traveling from United States to India and the plane is supposed to stop at London...The Halt is for 7 Hrs...So between this time if i want to roam london ,what is the procedure for that...I mean is there any temporary VISA or sumthing...please... show more Hey all the Travel Guru's out there...I wanted to know that if i am Traveling from United States to India and the plane is supposed to stop at London...The Halt is for 7 Hrs...So between this time if i want to roam london ,what is the procedure for that...I mean is there any temporary VISA or sumthing...please help me guy's and Girls of course........
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