anchor.diff:  http://og.decc.gov.uk/en/olgs/cms/explorationpro/onshore/seis_wells/ext_well_tests/ext_well_tests.aspx,,410
   http://og.decc.gov.uk/en/olgs/cms/explorationpro/onshore/seis_wells/oil_gas_discov/oil_gas_discov.aspx,,410
   http://og.decc.gov.uk/en/olgs/cms/explorationpro/onshore/seis_wells/seis_wells.aspx,,410
  -http://og.decc.gov.uk/en/olgs/cms/explorationpro/onshore/sg/sg.aspx,https://www.gov.uk/oil-and-gas-onshore-exploration-and-production,301
  +http://og.decc.gov.uk/en/olgs/cms/explorationpro/onshore/sg/sg.aspx,https://www.gov.uk/oil-and-gas-onshore-exploration-and-production#resumption-of-shale-gas-exploration,301
   http://og.decc.gov.uk/en/olgs/cms/explorationpro/operatorship/offshore_ops/offshore_ops.aspx,https://www.gov.uk/oil-and-gas-operatorship,301
   http://og.decc.gov.uk/en/olgs/cms/explorationpro/operatorship/onshore_ops/onshore_ops.aspx,https://www.gov.uk/oil-and-gas-operatorship,301
   http://og.decc.gov.uk/en/olgs/cms/explorationpro/operatorship/operatorship.aspx,https://www.gov.uk/oil-and-gas-operatorship,301
  
positive.code: http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/frc/frc.aspx#.,,410
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/guid_ppd/guid_ppd.aspx,https://www.gov.uk/oil-and-gas-operatorship,301
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/habitats/habitats.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation,301
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/leg_guidance.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation#the-energy-act-2008-part-4a-consent-to-locate,301
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/mercury/mercury.aspx,https://www.gov.uk/oil-and-gas-legislation-on-emissions-and-releases,301
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/msf/msf.aspx,,410
  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/ocr/ocr.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation,301
  
negative.code: http://og.decc.gov.uk/en/olgs/cms/information/bb_updates/maps/,,410
  http://og.decc.gov.uk/en/olgs/cms/licences/,,410
  http://og.decc.gov.uk/en/olgs/cms/licences/assets/og/licences/licencedocs/p1185.doc,,410
  http://og.decc.gov.uk/en/olgs/cms/licences/carbon_storage/carbon_storage.aspx,https://www.gov.uk/oil-and-gas-licensing-for-carbon-storage,301
  http://og.decc.gov.uk/en/olgs/cms/licences/gas_storage_an/gas_storage_an.aspx,https://www.gov.uk/oil-and-gas-licensing-for-gas-storage-and-unloading,301
  http://og.decc.gov.uk/en/olgs/cms/licences/lic_rounds/,,410
  http://og.decc.gov.uk/en/olgs/cms/licences/lic_rounds/10th_round/10th_round.aspx,https://www.gov.uk/oil-and-gas-licensing-rounds,301
  