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OS Code-Point Open
OSM Postcode/Mapnik/Osmarender layers are CC-BY-SA
OSM & contributors
NPE Post code layers are generated using data from NPE maps and are Public Domain.
FTP Post code layers are generated using data from Free The Postcode and are Public Domain.
Code-Point Open layers are CC-BY
This data contains Ordnance Survey data © Crown copyright and database right 2010.
Code-Point Open contains Royal Mail data © Royal Mail copyright and database right 2010.
Map colours are there to show distinct postcode prefixes, and have no specific meaning.
The postcode data here is updated weekly (hopefully) from those sources.