The dominant ‘modernisation’ perspective on the nature of nations and national identities characterises these phenomena as purely modern artefacts which function as sociological cement for complex industrial societies. In opposition, Anthony D. Smith has elaborated an ‘ethno-symbolist’ framework which posits the possibility of pre-modern antecedents to modern national identities. According to Smith, modern states which have been able to establish their official cultures on the ethnicity of a demographically dominant and cohesive ethnic core are likely to be more stable than states that are divided by the rival histories and traditions of competing ethno-national communities. This paper evaluates Smith's ethno-symbolist thesis by applying his work on the relationship between states and ethnic cores to the historical example of Britain. What is Britishness? Is it just a transnational state patriotism, or is it a secondary form of national identity constructed largely in English terms?