miliband 's approach was as choreographed as a torville and dean routine .
cameron kept firm hand on the leadership rudder and made no mistakes .
clegg 's smooth performance was a complete re-run of his 2010 routine .
farage was diminished during debate , perhaps the night 's only casualty .
sturgeon , wood and bennett took him down with series of small swats .
sturgeon 's speech about ` breaking up old boys network ' finished off coup .