The Conservative MPs included record numbers of corporate directors, bankers and businessmen, while Labour MPs were mostly from the working class. Bonar Law himself symbolised the change in the type of a Conservative MP as Bonar Law was a Presbyterian Canadian-born Scottish businessman who became in the words of his biographer, Robert Blake, the leader of "the Party of Old England, the Party of the Anglican Church and the country squire, the party of broad acres and hereditary titles". Bonar Law's ascent as leader of the Conservatives marked a shift in Conservative leaders from the aristocrats who generally led the party in the 19th century to a more middle class leadership who usually led the party in the 20th century. Many young veterans reacted against the harsh tone of the campaign and became disillusioned with politics.