Overnment by oligarchy and corruption. Is this a fair description of politics under Walpole?

Please do not narrate too much, as this is my problem. I would like to see how to write an essay without narrating and really analysing the material. A strong argument would be good.
Footnotes, bibliography. Preferably one primary source used and then a range of books and articles, for example, five books and two articles/journals.