Just a note: those Tres Bien Indy's are on a Barrie last in an E fitting; I just e-mailed Tres Bien as to their ambiguous description of them. I was hoping to pick up their Snuff Suede indys but no luck
I graduated from the LSE four years ago. The students there wear what the students everywhere wear. No one will be wearing a suit in your classes except maybe the professor. Jeans are fine anywhere you're likely to go. Grab some Alden indys (or substitute Trickers), some nice jeans, a shirt with buttons and you'll be at the top tier of dressing anywhere in London, I assure you.