By 2001, Britain had developed into a multi-party system, as evidenced by the rise of the Liberal Democrats after 1974 which changed the previous two-party system dominated by Labour and the Conservatives. Key political commentators like Ingle, McKenzie, and Heywood analyzed this change and provided evidence from electoral results and policies that showed the Liberal Democrats and other smaller parties now had greater influence over British politics. Devolution may have also impacted the evolving political system through giving more powers to Scottish and Welsh assemblies.