As a foreigner living in the UK this book helped me a lot. Now, it's much easier to understand why English people behave in certain ways that differs from my culture. I can now go to a pub with my colleagues, talk about the same subjects and also talk to strangers saying something like "nice weather, isn't it"? (Read the book and you'll understand why)
The very beginning of the book is boring because she repeats all the time her methods. After that the reading is very pleasant and I enjoyed it a lot. I think it deserves 4 stars and I definitely recommend to all foreigners living in the UK.