anchor.diff:  THANET,1843
   THAME,1844
   THIRSK,1845
  +THURSO,18472
  +THURSO,18473
  +THURSO,18474
  +THURSO,18475
  +THURSO,18478
  +TONGUE,18476
  +TONGUE,18477
  +TONGUE,18479
   THORNHILL,1848
  +GREAT BERNERA,18514
  +GREAT BERNERA,18516
  +GREAT BERNERA,18519
  +STORNOWAY,18512
  +STORNOWAY,18513
  +STORNOWAY,18515
  +STORNOWAY,18517
  +STORNOWAY,18518
   KILMELFORD,1852
   ULLAPOOL,1854
   BALLACHULISH,1855
  
positive.code: CHURCH STRETTON,1694
  SKELMERSDALE,1695
  BRAMPTON,1697
  MOTHERWELL,1698
  ROTHESAY,1700
  SOUTHEND-ON-SEA,1702
  
negative.code: LYBSTER,1593
  LYDNEY,1594
  LERWICK,1595
  FOULA,159575
  FAIR ISLE,159576
  LLANDRINDOD WELLS,1597
  LYNTON,1598
  KYLE,1599
  