"Prime Minister, I see you've already mastered the essential craft of the European politician, namely, the ability to say one thing in this chamber and a very different thing to your home electorate"

In this quote, Daniel Hannan is addressing the Prime Minister and explaining a common trait among European political leaders. He is recommending that the Prime Minister has already mastered the art of stating something in the European chamber and after that saying something totally various to their own country's citizens. This indicates that politicians often control their words and messages depending on their audience, instead of being authentic and constant in their beliefs and guarantees. Hannan is slamming this habits and highlighting the lack of authenticity and honesty in European politics.