My boyfriend studies International Business in Nottingham (which is a lovely town, but it's certainly not London!) For me, I decided London was far too expensive, and that I could get a better education in my field elsewhere (and cheaper). The UK often prices different courses at different tuition rates, so be prepared for that! I just couldnt fathom spending 23,000gbp on tuition rather than 14,000 simply to attend uni in London.

I do know that the
London School of Economics is very well regarded, and has a wide variety of programs with the word "International" in their
course titleOther than that, you could also look into the usual suspects like UCL, King's, and Imperial. Good luck!