Indeed. It's quite explicit, for example, in the British government's information on "Support for British nationals abroad": "If you have some connection with

Indeed. It's quite explicit, for example, in the British government's information on "Support for British nationals abroad": "If you have some connection with another country – for example, by birth, by descent through either parent, by marriage or by residence – you may be a national of that country as well as being a British national. ... You may still have certain responsibilities with that country, such as compulsory military service."