By City A.M. Reporter A former MSP who quit Holyrood for Westminster has urged the Scottish Parliament to “up its game”. Former Scottish secretary David Mundell insisted that Holyrood “still has the capacity to be a force for good right across Scotland”. But he claimed while Holyrood’s committees had previously been “lauded” for their work, Westminster’s committees were now “more effective”, saying this was in part due to their system of electing committee chairs. Mundell also claimed it “would be beneficial” for joint committees, involving both MPs and MSPs, to be convened on areas that the S…