anchor.diff:  2931 May,ComRes/Daily Mail,1000,41.0,29.0,10.0,8.0,5.0,5.0,3.0,12.0,2015
   2526 May,YouGov/The Sun,1709,41.0,30.0,13.0,7.0,4.0,4.0,1.0,11.0,2015
   89 May,Survation/Mail on Sunday,1027,40.0,31.0,12.0,6.0,5.0,3.0,2.0,9.0,2015
  -7 May,General Election results (GB only)[2][3],29980107,37.8,31.2,12.9,8.1,4.9,3.8,1.4,6.6,2015
  +7 May,General Election results (GB only)[4][5],29980107,37.8,31.2,12.9,8.1,4.9,3.8,1.4,6.6,2015
  
positive.code: 1923 May,Panelbase/The Sunday Times,1019,48.0,33.0,4.0,7.0,5.0,2.0,1.0,15.0,2017
  1822 May,Kantar Public,1200,42.0,34.0,4.0,9.0,4.0,4.0,2.0,8.0,2017
  1921 May,ICM/The Guardian,2004,47.0,33.0,4.0,9.0,4.0,2.0,1.0,14.0,2017
  1920 May,Survation/Good Morning Britain (telephone),1034,43.0,34.0,4.0,8.0,3.0,2.0,5.0,9.0,2017
  1920 May,Survation/Mail on Sunday (online panel),1017,46.0,34.0,3.0,8.0,4.0,1.0,3.0,12.0,2017
  1819 May,YouGov/Sunday Times,1925,44.0,35.0,3.0,9.0,5.0,2.0,1.0,9.0,2017
  1617 May,Opinium/Observer,2003,46.0,33.0,5.0,8.0,5.0,2.0,1.0,13.0,2017
  1617 May,YouGov/The Times,1861,45.0,32.0,6.0,8.0,5.0,2.0,1.0,13.0,2017
  
negative.code: 23 May,YouGov/The Times,2066,48.0,29.0,5.0,10.0,5.0,2.0,1.0,19.0,2017
  28 Apr2 May,Panelbase,1034,47.0,30.0,5.0,10.0,5.0,2.0,1.0,17.0,2017
  28 Apr2 May,ICM/The Guardian,1970,47.0,28.0,8.0,8.0,3.0,4.0,1.0,19.0,2017
  28 Apr1 May,Qriously,1240,35.0,23.0,6.0,7.0,2.0,3.0,,12.0,2017
  27 Apr2 May,Kantar Public,1205,48.0,24.0,7.0,11.0,4.0,4.0,2.0,24.0,2017
  2728 Apr,YouGov/Sunday Times,1612,44.0,31.0,6.0,11.0,4.0,2.0,2.0,13.0,2017
  2628 Apr,ICM/Sun on Sunday,2012,47.0,28.0,8.0,9.0,4.0,4.0,,19.0,2017
  