Dear Kishan,
I'd like to help. I am a Third Year ESPS student currently on my year abroad in Florence.
There are many people who come who do what you do, and I am sure that you will be alright.
The following things I say without bias, having observed them at length:
ESPS is one of the most heavily academic and excellent (as in they excel) courses in UCL. You will find that ESPS students often stand a head above other students (even in their own departments). In terms of course choice, you pretty much can select any humanities courses, including (but not limited to) Politics, International Relations, Economics, Law, History, Philosophy, Geography, etc.
Teaching at ESPS proper is rather good, if limited to only a few courses. However, you can pick almost any course and as a result you can pick what best suits you and your academic direction, including courses with the best lecturers. I will confess that the choice of politics proper courses is limited since UCL doesn't have a dedicated politics department (this is as close as it comes) but you can pick related history, IR or philosophy courses that will add up to the same or better than you will get anywhere. The Economics department is one of the best in the country and since you can pick your own courses you will be fine. There are a number of tutors who link ESPS with other departments who should be willing to help and provide any further guidance. They are very friendly.
ESPS is almost 50% comprised of students from the EU and other countries so you network with people from across the globe. In addition to this UCL is the most international of all British universities with 40% of its students from abroad. As a result, you are often much more likely to encounter foreigners than British students (I've had trouble finding enough British friends
)
Lastly, the CAreers Service is excellent providing all the services you need and should help you structure your CV and career perspectives as to your wishes.
Good luck!