If you wish to study Politics, Government or similar courses, consider Warwick but only LSE if you are more than outstanding (ie consistently 17+ out of 20 for the Baccalauréat, or 6 for the Maturité).
Kings London has a course called Politics of the International Economy is worth looking at if you are not at the LSE level!
Plus there are loads of Economics/Politics courses that are a better fit than LSE.