Source: p 5. Rhetoric: A Very Short Introduction (1 ed, 2013) by Richard Toye.
In particular, it is important to be sensitive to differences in political systems—giving a speech in the British House of Commons is a different affair from giving one in the US Senate, the European Parliament, or the French National Assembly. Even apparently similar systems can produce remarkably different cultures of speech: like the British, the Australians operate the 'Westminster model' but have a tradition of robust political insult that puts the efforts of the mother country's parliamentarians in the shade. It is also important to be sensitive to change over time. In the late nineteenth century, the lengthy and convoluted orations of British Prime Minister W. E. Gladstone were widely acclaimed and sustained his enthusiastic popular following; a century later they would have seemed radically out of place.
I can infer that 'mother country' refers to England, but I do not understand the bolded Verb Phrase.
What does 'robust political insult' mean?
What about the UK Parliament, is the Australian Parliament's 'putting in the shade'?