My head-cannon about the whole Oxford/London thing is that this period of his life has made him into the confident and assertive Shravan Malhotra we see.
Oxford/Cambridge are like the holy grail of education, the biggest "nerds" in the world go here and the bigger the nerd you are, the cooler it is. I imagine Shravan going from being ridiculed and made fun of for being a bookworm in high school to someone who was probably whole-heartedly accepted by his peers.And if you interact with the kids that go to Oxford/Cambridge (or Ivy League in the States) you'll notice that they're hella confident about themselves, they've literally been bred to believe that they're the creme de la creme, and they are. If you sit in one of these classes, the professors will keep reminding you of the great people who have sat there before you, and it's like the biggest confident boost in life, you leave these schools feeling like you're the shit! Especially, people that are at grad school in these places!I see Shravan learning how to love and accept himself from them, this is where the Shravan we see now emerged from. I see him going to the gym like every day to fill out and feel better about himself and girls giving him attention all of a sudden and his mind being boggled by the differences - the flirty and charming Shravan comes from here.I would honestly love it if they touched up more on his life there, just throw me an Oxford sweater and I'll be happy tbh.