> European citizenship confers a number of privileges: the right to live in and move freely between member states, the right to diplomatic and consular assistance from other member states, and the right to participate in elections to the European parliament. The shared assumption of the European Union and the UK government is that Brexit will mean British citizens will automatically forfeit these rights.

I'm having a hard time imagining how it could be otherwise. The EU and the UK could certainly come to terms on some of these issues but I seriously doubt that UK citizens will be allowed move freely between member states if the converse is not allowed as well (i.e. EU citizens entering and leaving freely the UK). I seriously doubt that UK citizens will be represented in the European parliament.