A oversea student may not have a superior advantage over the local grads. This is true when the oversea student stick only to themselves or ppl from the same country. If you look at a lot of chinese students from china, they tend to group with fellow students who are from china, and this i can say is the same for most tarcian who came over to the uk for the 3mth degree program,

bird of a feather flocks together.... that's a common thing,

edit....
no matter where u grad or what college or uni u grad, the work attitude and character is more important than the degree.

i m living with a chinese from china who has been in the uk for 4 yrs , done his degree n masters, still is rubbish at work, even though from top uni.... london imperial college..... he also does not speak and understand english at that level of a form3 SK sudent is msia....