anchor.diff:  "SG10","542700","218300","51.84460","0.07178","Much Hadham","Hertfordshire","ENG","England"
   "SG11","539900","222300","51.88125","0.03278","Standon","Hertfordshire","ENG","England"
   "SG12","536700","214700","51.81375","-0.01669","Ware","Hertfordshire","ENG","England"
  -"SG13","533200","211600","51.78673","-0.06863",,"Hertford","ENG","England"
  -"SG14","531600","213800","51.80688","-0.09098",,"Hertford","ENG","England"
  +"SG13","533200","211600","51.78673","-0.06863","Hertford","Hertfordshire","ENG","England"
  +"SG14","531600","213800","51.80688","-0.09098","Hertford","Hertfordshire","ENG","England"
   "SG15","519300","236400","52.01276","-0.26149","Arlesey","Central Bedfordshire","ENG","England"
   "SG16","516900","236600","52.01507","-0.29638","Henlow","Central Bedfordshire","ENG","England"
   "SG17","514500","238700","52.03445","-0.33063","Shefford","Central Bedfordshire","ENG","England"
  
positive.code: "WN6","355700","408800","53.57369","-2.66908","Pemberton","Wigan","ENG","England"
  "WN7","365700","400300","53.49803","-2.51712","Leigh","Wigan","ENG","England"
  "WN8","349100","406500","53.55242","-2.76838","Ormskirk","Lancashire","ENG","England"
  "WR1","385200","255500","52.19713","-2.21656",,"Worcester","ENG","England"
  "WR10","395600","246300","52.11459","-2.06426","Wick","Worcestershire","ENG","England"
  "WR11","404900","244100","52.09481","-1.92847","Evesham","Worcestershire","ENG","England"
  "WR12","408700","238300","52.04261","-1.87314","Broadway","Worcestershire","ENG","England"
  "WR13","376600","244100","52.09433","-2.34161","Colwall","County of Herefordshire","ENG","England"
  "WR14","378200","246200","52.11328","-2.31839","Great Malvern","Worcestershire","ENG","England"
  "WR15","361300","267600","52.30476","-2.56764","Tenbury","Worcestershire","ENG","England"
  "WR2","383500","254700","52.18989","-2.24139",,"Worcester","ENG","England"
  "WR3","385600","257600","52.21603","-2.21079",,"Worcester","ENG","England"
  "WR4","387400","256300","52.20438","-2.18440",,"Worcester","ENG","England"
  "WR5","386400","253300","52.17738","-2.19891",,"Worcester","ENG","England"
  "WR6","374700","258900","52.22732","-2.37045","Martley","Worcestershire","ENG","England"
  "WR7","396400","255400","52.19642","-2.05268","North Piddle","Worcestershire","ENG","England"
  "WR8","386100","242700","52.08207","-2.20287","Worcester","Worcestershire","ENG","England"
  
negative.code: "HP7","496200","197200","51.66487","-0.60890","Amersham","Buckinghamshire","ENG","England"
  "HP8","498700","194800","51.64286","-0.57344","Chalfont St Giles","Buckinghamshire","ENG","England"
  "HP9","494300","191100","51.61035","-0.63801","Beaconsfield","Buckinghamshire","ENG","England"
  "HR1","354100","240900","52.06415","-2.66963","Hampton Bishop","Herefordshire","ENG","England"
  "HR2","346200","234900","52.00950","-2.78393","Allensmore","Herefordshire","ENG","England"
  "HR3","326400","244500","52.09353","-3.07446","Clifford","Herefordshire","ENG","England"
  "HR4","347500","243600","52.08784","-2.76632","Burghill","Herefordshire","ENG","England"
  "HR5","329800","255400","52.19196","-3.02708","Kington Rural","Herefordshire","ENG","England"
  "HR6","347400","259700","52.23258","-2.77028","Leominster","Herefordshire","ENG","England"
  "HR7","364400","254400","52.18629","-2.52079","Bromyard","Herefordshire","ENG","England"
  "HR8","369600","238600","52.04454","-2.44331","Ledbury","Herefordshire","ENG","England"
  "HR9","360000","223500","51.90816","-2.58153","Ross-on-Wye","Herefordshire","ENG","England"
  "HS1","142700","933300","58.21347","-6.38138","Stornoway","Eilean Siar","SCT","Scotland"
  "HS2","137900","937600","58.24916","-6.46768",,"Eilean Siar","SCT","Scotland"
  "HS3","112300","898000","57.87876","-6.85387",,"Eilean Siar","SCT","Scotland"
  