Some things not to do in London.

* I recommend looking both ways so that you don't get hit by a car when you get back to your home country.

** For example, if you want to order coffee in the park cafe. Of course, you can shout: "One latte." You'll get it. But it would be nice: "Good morning. Nice weather today. Sorry, can I have a caffè latte, please? Thank you."

By the way, it is better instead of "latte" say "caffè latte", the person behind the counter may be an Italian. In Italian latte means milk. :-)