The political declaration envisages separate mobility provisions embraced in a new treaty covering the future relationship between the UK and the EU after Brexit. It specifically scopes out the idea that there will be an enhanced mobility regime in any event, so you will not get only one set of immigration rules. Just like now, if you are an EU citizen, you do not have an EU right of residence; you acquire leave to enter or remain, like any third-country national.
The political declaration specifically envisages the new relationship as having separate regional arrangements, because of the intensity of journeys and circulation in the region, not because of discrimination on the grounds of nationality. The Government’s aspiration, and that of the Commission, is that there will be an enhanced regime in the region, if the political declaration finds expression in a future relationship treaty. That is what we will have in any event.
To say that there will be a universal floor is a good thing, but there may be other treaty arrangements with other regions, just as Australia and New Zealand have a free movement system between them—