Why are British people so polite?

Answer by Anonymous:

I have been in the UK for the past 4 years and I can say that they are always polite….in informing you that you are wrong!
Here is a translation table that is available on-line and I can swear that it is true in most occasions. The Brits have the knack of putting things in such a way that the listener thinks everything is good but the reality is otherwise!

Source: Translation table explaining the truth behind British politeness becomes internet hit – Telegraph

Why are British people so polite?