anchor.diff:  "WC1R","530700","181700","51.51860","-0.11604","Camden Town","Greater London","ENG","England"
   "WC1V","530500","181500","51.51685","-0.11899","Camden Town","Greater London","ENG","England"
   "WC1X","530700","182400","51.52489","-0.11578","Camden Town","Greater London","ENG","England"
  -"WC2","530200","181100","51.51332","-0.12346","Westminster","London","ENG","England"
  +"WC2","530200","181100","51.51332","-0.12346",,"Westminster","ENG","England"
   "WC2A","530800","181400","51.51588","-0.11471","Camden Town","Greater London","ENG","England"
  -"WC2B","530300","181300","51.51510","-0.12195","Westminster","London","ENG","England"
  -"WC2E","530200","181000","51.51242","-0.12350","Westminster","London","ENG","England"
  +"WC2B","530300","181300","51.51510","-0.12195",,"Westminster","ENG","England"
  +"WC2E","530200","181000","51.51242","-0.12350",,"Westminster","ENG","England"
   "WC2H","529900","181100","51.51339","-0.12778","Camden Town","Greater London","ENG","England"
  -"WC2N","530100","180700","51.50975","-0.12505","Westminster","London","ENG","England"
  -"WC2R","530500","180900","51.51145","-0.11921","Westminster","London","ENG","England"
  +"WC2N","530100","180700","51.50975","-0.12505",,"Westminster","ENG","England"
  +"WC2R","530500","180900","51.51145","-0.11921",,"Westminster","ENG","England"
   "WD1","510700","195500","51.64692","-0.39984","Watford","Hertfordshire","ENG","England"
   "WD17","510300","197100","51.66138","-0.40512","Watford","Hertfordshire","ENG","England"
   "WD18","509700","195600","51.64801","-0.41426","Watford","Hertfordshire","ENG","England"
  
positive.code: "UB7","506200","179700","51.50576","-0.46964","Hillingdon","Greater London","ENG","England"
  "UB8","505900","182900","51.53458","-0.47300","Hillingdon","Greater London","ENG","England"
  "UB9","504600","188100","51.58157","-0.49019","Denham Green","Buckinghamshire","ENG","England"
  "W1","528900","181200","51.51452","-0.14215","Westminster","London","ENG","England"
  "W10","523900","181800","51.52103","-0.21397","Kensington","Greater London","ENG","England"
  "W11","524600","180800","51.51189","-0.20424","Kensington","Greater London","ENG","England"
  "W12","522900","180300","51.50777","-0.22890","Hammersmith","Greater London","ENG","England"
  "W13","516600","180700","51.51270","-0.31951","Ealing","Greater London","ENG","England"
  "W14","524300","178900","51.49488","-0.20923","Hammersmith","Greater London","ENG","England"
  "W1B","529100","181100","51.51357","-0.13931","Westminster","London","ENG","England"
  "W1C","528500","181100","51.51371","-0.14795","Westminster","London","ENG","England"
  "W1D","529700","181100","51.51344","-0.13066","Westminster","London","ENG","England"
  "W1F","529400","181000","51.51261","-0.13502","Westminster","London","ENG","England"
  "W1G","528600","181600","51.51818","-0.14633","Paddington","Greater London","ENG","England"
  "W1H","527700","181400","51.51659","-0.15936","Paddington","Greater London","ENG","England"
  "W1J","528800","180400","51.50735","-0.14388","Westminster","London","ENG","England"
  "W1K","528400","180800","51.51104","-0.14950","Westminster","London","ENG","England"
  "W1M","528400","181600","51.51823","-0.14921","Paddington","Greater London","ENG","England"
  "W1S","529000","180800","51.51090","-0.14086","Westminster","London","ENG","England"
  "W1T","529400","181800","51.51980","-0.13473","Camden Town","Greater London","ENG","England"
  "W1U","528200","181600","51.51827","-0.15209","Paddington","Greater London","ENG","England"
  "W1W","529100","181700","51.51897","-0.13909","Paddington","Greater London","ENG","England"
  
negative.code: "PH40","169900","792200","56.96381","-5.78560",,"Highland","SCT","Scotland"
  "PH41","167300","796800","57.00374","-5.83251","Mallaig","Highland","SCT","Scotland"
  "PH42","147900","786600","56.90217","-6.14094","Isle Of Eigg","Highland","SCT","Scotland"
  "PH43","140200","799700","57.01529","-6.28049","Isle Of Rum","Highland","SCT","Scotland"
  "PH44","127000","805200","57.05693","-6.50319","Isle Of Canna","Highland","SCT","Scotland"
  "PH49","209500","758000","56.67500","-5.10977","Glencoe","Highland","SCT","Scotland"
  "PH5","287000","716700","56.32927","-3.82770","Muthill","Perth and Kinross","SCT","Scotland"
  