The data set 'UKmarbledWhite' is released under the UK Open Government Licence <http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/> which is compatible with the Creative Commons Attribution (CC-BY) license. The following organizations must be attributed as the source of the information: The UK Butterfly Monitoring Scheme (UKBMS), Butterfly Conservation, the Centre for Ecology and Hydrology, British Trust for Ornithology, and the Joint Nature Conservation Committee. The UKBMS is indebted to all volunteers who contribute data to the scheme.