in a nightmare for labour , which is battling to fend off an snp landslide in its traditional scottish heartlands , miss sturgeon was deemed well ahead -rrb- with mr miliband trailing david cameron and nigel farage .
overall , an average of four polls of viewers put mr cameron just ahead .
to the tories ' delight , he also emerged with a clear lead on who is seen ` most capable of leading the country ' that