there wasn't a lot of difference in their class. The Daily Mail highlighted this a few years back, probably at the same time that the Labour party was spinning Brown as growing up shoeless in a two up two down
www.dailymail.co.uk/news/article-465259/Gordon-Browns-Tory-family-revealed.html
The other fallacy in Toby's article is to assume that only the lower classes are capable of low-down skullduggery when angling for power. Many of the upper classes are also capable of what Brown is claimed to have done and more.