"He was not only a bore; he bored for England"

This quote by Malcolm Muggeridge is a funny way of saying that the person in concern was exceptionally boring. It suggests that the person was so uninteresting that they might represent the entire nation of England in the realm of being dull. It is a method of overemphasizing the level of monotony that the individual was capable of producing. It is likewise a way of poking fun at the person, as it indicates that they are so boring that they might be a representative of an entire country. It is a funny way of expressing the concept that the individual was incredibly dull and boring.