Prestige: undergraduate versus postgraduate degrees

I don't understand why everybody's being so ridiculously hostile on this thread. I mean, come on, how much do you know about Indian universities? The OP is just trying to get the best out of their education and that means asking questions. Even if those questions are "stupid" or unanswerable, there's absolutely no need to burn them at the stake just for not knowing everything automatically. I mean, I doubt any of you were born with an innate knowledge of the university system, so have a little tolerance for people. Yes, the OP shows ignorance, but at least they're trying to rectify their ignorance. It's a damn sight more than most ignorant people do.

In economics it's pretty well established that LSE has the strongest postgraduate course in the UK.

I can speak for my subject (IR/Politics), LSE by far has a greater concentration of leading academics in the field than either Oxford or Cambridge (definitely Cambridge--I don't even rate them). I didn't consider either when applying for masters courses.

I do not want to be an academic. Nevertheless, I enjoy Economics and have a serious interest in Politics (hence I applied for PPE). Therefore I am disappointed that I would not be able to benefit from Oxford small-group tutorial system.
Thus there are three reasons for my Oxford postgraduate decision. First, I like to think that it would compensate for my lack of experience of the one-to-one tutorial system study (tell me if I am wrong). Secondly, I want to do something in Politics/International Relations - due to interest and perhaps a career option. Lastly, again, the 'Oxford tag'.

I am aware the in postgraduate studies LSE is more reputed than Oxford (for Economics). But my main dilemma is that will an Oxford postgraduate degree give me the same 'prestige' (I do not like to use the word again and again, lol) as an Oxford undergraduate degree holder. In short does a postgrad degree have the same status as an undergrad?