anchor.diff:  "Date(s)
   conducted",Polling organisation/client,Sample size,Con,Lab,UKIP,Lib Dem,SNP,Green,Others,Lead,Year
  -30 May1 Jun,Ipsos MORI/Evening Standard,1046,45.0,40.0,2.0,7.0,3.0,2.0,,5.0,2017
  +8 June,General Election results (GB only) [2],31384735,43.5,41.0,1.9,7.6,3.1,1.7,1.2,2.5,2017
  +67 Jun,Ipsos MORI/Evening Standard,1291,44.0,36.0,4.0,7.0,5.0,2.0,2.0,8.0,2017
  +67 Jun,BMG/The Herald,1199,46.0,33.0,5.0,8.0,4.0,3.0,2.0,13.0,2017
  +67 Jun,Survation,2798,41.0,40.0,2.0,8.0,4.0,2.0,2.0,1.0,2017
  +67 Jun,ICM/The Guardian,1532,46.0,34.0,5.0,7.0,5.0,2.0,1.0,12.0,2017
  +57 Jun,YouGov/The Times,2130,42.0,35.0,5.0,10.0,5.0,2.0,1.0,7.0,2017
  +57 Jun,ComRes/Independent,2051,44.0,34.0,5.0,9.0,4.0,2.0,1.0,10.0,2017
  +27 Jun,Panelbase,3018,44.0,36.0,5.0,7.0,4.0,2.0,2.0,8.0,2017
  +17 Jun,Kantar Public,2159,43.0,38.0,4.0,7.0,4.0,2.0,2.0,5.0,2017
  +46 Jun,SurveyMonkey/The Sun,11000,42.0,38.0,4.0,6.0,3.0,2.0,5.0,4.0,2017
  +46 Jun,Opinium,3002,43.0,36.0,5.0,8.0,5.0,2.0,1.0,7.0,2017
  +24 Jun,ICM/The Guardian,2000,45.0,34.0,5.0,8.0,4.0,3.0,1.0,11.0,2017
  +23 Jun,Survation/Good Morning Britain[b],1103,41.0,40.0,3.0,6.0,4.0,1.0,4.0,1.0,2017
  +12 Jun,YouGov/Sunday Times,1989,42.0,38.0,4.0,9.0,4.0,2.0,0.0,4.0,2017
  +31 May2 Jun,ICM/The Sun on Sunday,2051,45.0,34.0,5.0,9.0,4.0,3.0,1.0,11.0,2017
  +31 May2 Jun,"ComRes/Sunday Mirror, Independent on Sunday",2038,47.0,35.0,4.0,8.0,3.0,1.0,1.0,12.0,2017
  +31 May1 Jun,Norstat,1013,39.0,35.0,6.0,8.0,,3.0,9.0,4.0,2017
  +30 May1 Jun,Ipsos MORI/Evening Standard[b],1046,45.0,40.0,2.0,7.0,3.0,2.0,1.0,5.0,2017
   26 May1 Jun,Panelbase,1224,44.0,36.0,5.0,7.0,5.0,2.0,1.0,8.0,2017
  -26 May1 Jun,YouGov[b],53000,42.0,38.0,3.0,9.0,4.0,2.0,1.0,4.0,2017
  +3031 May,Opinium/Observer,2006,43.0,37.0,5.0,6.0,5.0,2.0,1.0,6.0,2017
   3031 May,YouGov/The Times,1875,42.0,39.0,4.0,7.0,4.0,2.0,1.0,3.0,2017
  -2531 May,YouGov[b],53611,42.0,38.0,3.0,9.0,4.0,2.0,2.0,4.0,2017
   2530 May,Kantar Public,1199,43.0,33.0,4.0,11.0,4.0,3.0,1.0,10.0,2017
  -2430 May,YouGov[b],53464,41.0,38.0,4.0,9.0,4.0,2.0,2.0,3.0,2017
   2629 May,ICM/The Guardian,2002,45.0,33.0,5.0,8.0,4.0,3.0,2.0,12.0,2017
  -2627 May,Survation/Good Morning Britain,1009,43.0,37.0,4.0,8.0,2.0,1.0,4.0,6.0,2017
  +2629 May,Qriously,1153,36.0,32.0,4.0,5.0,3.0,3.0,,4.0,2017
  +2627 May,Survation/Good Morning Britain[b],1009,43.0,37.0,4.0,8.0,2.0,1.0,4.0,6.0,2017
   2526 May,YouGov/Sunday Times,2003,43.0,36.0,4.0,9.0,4.0,2.0,1.0,7.0,2017
   2426 May,ICM/The Sun on Sunday,2044,46.0,32.0,5.0,8.0,4.0,2.0,1.0,14.0,2017
   2426 May,"ComRes/Sunday Mirror, Independent on Sunday",2024,46.0,34.0,5.0,8.0,4.0,2.0,1.0,12.0,2017
  
positive.code: 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
  
negative.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[b],1034,43.0,34.0,4.0,8.0,3.0,2.0,5.0,9.0,2017
  1920 May,Survation/Mail on Sunday,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
  