Ajay,

from what I know Rajni's films have "always " been the top grosser in N.America, followed by Kamal. Having said that I think Kathhi and thuppaki did better than Linga in UK, AFAIK Vijay has a bit more fans than Rajni in UK ( Based on my observation) and Vijay fans are mainly under 30's and are of Lankan background.. But for Rajni and Kamal it is mainly the IT crowd..