The food stands out. Like Australia has too many fat people too, but our restaurants don't cater to them like America's - don't try to feed everyone a meal suited to a 200kg man trying for 300.
Most of the food comes from fast food along stroads. It is a core part of the problem. The education system is probably the root, but I wouldn't expect a tourist to understand that.
Agreed to both of these points, though as an American I will say there are healthier options, it's just that they make those cost twice as much as the cheaper, unhealthy options.
Sremoved is just a variant form more common in the UK, where snicker is the preferred one in the US. Though I wouldn't put it past a 4chan user, it's also a perfectly normal word they may have learned being taught and exposed to UK variants of English.
I thought, and a quick Google confirms, that it is used in the Harry Potter series a few times. Obviously, you might not have read them, but for people in my cohort, that was likely our largest exposure point to British culture.