Legislatures appoint committees for different purposes. Both Houses of the UK Parliament separate legislative committees from non-legislative, or select, committees. Each is unusual in that it utilises select committees to engage in post-legislative scrutiny. We examine why each engages in this type of scrutiny, given competing demands for limited resources. Distributive and informational theories are utilised to explain the difference between the two chambers, identifying why the form of asymmetrical bicameralism to be found in the United Kingdom facilitates scrutiny that would otherwise not be undertaken. The genesis and impact of post-legislative scrutiny committees are considered, with a focus on the House of Lords and why the use of such committees plays to the strengths of the House.