A few years ago I worked on a project with some employees from our British office. We had a friendly discussion about using British spelling and vocabulary for a course we were creating. They would say, "The British created English." We would reply, "But the Americans perfected the language." It was a fun discussion about the different spelling, pronunciation, and vocabulary of the language that we share.
EnglishClass101 is an excellent site for students who want to learn English as a Second Language. They also have an app that introduces you to British English. This app provides you with a list of 107 British words and their pronunciation. You can access all of them at once or access them by a specific category:
I tried the drink category and learned the names of two drinks, the dandelion and burdock, and the shandy. The app pronounced the words for me and provided me pictures for reference. Unfortunately, they didn't provide definitions. I think I would like a shandy.
So, what is a dandelion and burdock? A shandy? According to Wikipedia, a dandelion and burdock is a carbonated drink that includes the dandelion plant and the burdock plant and tastes similar to sarsaparilla. A shandy is a beer mixed with a soft drink.
There are a variety of sites that contain information about the differences between British and American English. Here are some that I think you will find useful.
You may also find these articles interesting. They are from the BBC website.