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Scottish Social Attitudes surveys have good over-time data on people’s choices of national identity, specifically, how they relate being Scottish to being British.

There are comparable data for Britain as a whole in British Social Attitudes surveys.

The 2011 Census also has data on national identity, as follows: http://www.scotlandscensus.gov.uk/news/census-2011-detailed-characteristics-ethnicity-identity-language-and-religion-scotland-–

For comparable English and Welsh data, see http://www.ons.gov.uk/peoplepopulationandcommunity/culturalidentity/ethnicity/articles/ethnicityandnationalidentityinenglandandwales/2012-12-11

More generally, McCrone and Bechhofer’s Understanding National Identity, 2015, analyses national identity in Scotland and England.