anchor.diff:  3,Welwyn East,E07000241,Welwyn Hatfield,DIS,E05004865,
   3,Welwyn West,E07000241,Welwyn Hatfield,DIS,E05004866,
   3,Werrington,E06000031,Peterborough,UTA,E05010824,
  -3,West Byfleet,E07000217,Woking,DIS,E05007456,
   3,West Ecclesfield,E08000019,Sheffield,MTD,E05010883,
   3,Westbury-on-Trym and Henleaze,E06000023,Bristol,UTA,E05010917,
   3,Weybridge Riverside,E07000207,Elmbridge,DIS,E05011088,
  
positive.code: 1,Yateley East,E07000089,Hart,DIS,E05009361,
  1,Yateley West,E07000089,Hart,DIS,E05009362,
  1,Yaxley and Farcet,E07000011,Huntingdonshire,DIS,E05002790,
  1,Yew Tree,E08000012,Liverpool,MTD,E05000915,
  1,Yewdale,E07000028,Carlisle,DIS,E05003179,
  2,"Randwick, Whiteshill and Ruscombe",E07000082,Stroud,DIS,E05010982,
  
negative.code: 3,Brookmans Park and Little Heath,E07000241,Welwyn Hatfield,DIS,E05004850,
  3,Broomhill and Sharrow Vale,E08000019,Sheffield,MTD,E05010860,
  3,Burngreave,E08000019,Sheffield,MTD,E05010861,
  3,Callowland,E07000103,Watford,DIS,E05004838,
  3,Cam West,E07000082,Stroud,DIS,E05010973,
  3,Canalside,E07000217,Woking,DIS,E05010796,
  