Look, there's nothing wrong with spending your every weekend visiting distant postcodes of London with a clipboard and a selection of differently-coloured felt tip pens, noting the ethnic make-up of the area. That's totally normal, and definitely won't send you a little bit crazy. I saw a black student and a white student on the bus together today having a laugh, but I could tell that each was yearning for a closer cultural affinity. They weren't too impressed with me making some notes on the matter though. It was only when I asked them if they got their clothes off the market things got a bit nasty, though. They weren't to know I was only after information for my survey on the retail habits of indigenous and immigrant peoples. Never mind, such field research is vital, and I shall not be downhearted.