Between 2005 and 2024, Theresa served in the House of Commons as MP for Chipping Barnet. In December 2005, after just seven months in parliament, David Cameron appointed Theresa to his Shadow Cabinet as Shadow Chief Secretary to the Treasury. As well as working with George Osborne on Conservative economic policy, Theresa led the Opposition scrutiny of the Finance Bills in 2006 and 2007 – this process is a notoriously complex and difficult task but Theresa gained vital concessions from Gordon Brown who was then the Chancellor. At David Cameron’s first reshuffle in July 2007, she gained further promotion and was appointed Shadow Secretary of State for Transport.