Shadow Secretary of State for Work and Pensions, Theresa May (R) gestures during the third day of the Conservative Party Conference in Manchester, north-west England, on October 7, 2009. British opposition leader David Cameron will seek to show Thursday he is ready to take power, amid simmering tensions over his Conservative party's stance on Europe. Cameron will close the centre-right party's annual conference here with a speech outlining what the party would do in government if, as opinion polls suggest is likely, they win the next general election due by June.