Lkl

I am almost done with a Ba in Philosophy at an european university and want to study something Political/social Science-related at graduate level.
 During the past 2 and a half years, I have taken many purely philosophical course such as theoretical philosophy, logic, philosophy of language, but also others which are more related to the field I want to focus on in the future such as political philosophy, political theory and IR, international political economy, economics of the Euro and will take some more Poli Sci courses next semester as well.
 Once I´ll be done at my current university, my degree will more or less be 2/3 focused on philosophy (including political philosophy) and 1/3 in social science-related stuff.

Do I have any chance of getting into a grad course in a social science? I´m especially considering LSE (I already took two summer school courses there), maybe UCL as well.
My GPA is very high at the moment (most of my grades are top grades, I think they corresponds to A+s in the US) though I still have two exam sessions available to ruin it all 
The problem is that for instance at LSE almost all courses require a "2:1 in any of the social sciences" or "2:1 in politics, economics, history, international relations or similar discipline". How do you define a "similar discipline"? Will I automatically be put aside in the "Humanities" category with a Ba in Philosophy?