Any future free trade deals must include freedom of movement of people

With the right of UK citizens to live, work, and travel visa-free and unhindered in the EU to disappear as the UK leaves the bloc, we must write into law that any future free trade deals signed with any countries will include free movement of people to complement free movement of goods, services and capital.
If money and trade can cross borders, so should people, else global inequality will increase, and the common heritage of this planet's surface will continue to be denied to its inhabitants.