anchor.diff:  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/,,410
   http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/,,410
   http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks.,,410
  -http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks.aspx,https://www.gov.uk/oil-and-gas-fallow-blocks-and-discoveries,301
  +http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks.aspx,https://www.gov.uk/oil-and-gas-fallow-blocks-and-discoveries#fallow-reviews-2012,301
   http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks/,,410
   http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/geoscientific/geoscientific.aspx,https://www.gov.uk/oil-and-gas-geoscientific-data,301
   http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/practices/practices.aspx,,410
  
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/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#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
  