The various policy positions put forward by the UK government on Brexit this week were an attempt to present a coherent picture as to how it would like to see future relationships with the EU develop. However, the vision presented by David Davis, the minister responsible for leading the UK out of Europe, merely reinforced the view that there is a total lack of understanding within the corridors of Westminster as to the complexity of the challenges that Brexit presents. Davis is offering two proposals on a future customs relationship: either “a highly streamlined customs arrangement between the UK and the EU” or a “new customs partnership with the EU”. However, both proposals hinge on the UK retaining its freedom to agree third-country trade deals. This in-and-out approach to the customs union has been described within Brussels as a fantasy.