Boris Johnson, the front-runner to be Britain’s next prime minister, has raised the prospect of a shock for the world’s fifth-biggest economy by pledging to leave the European Union on Oct. 31 without a transition deal if necessary.

Rules on travelling to and from European Union countries will change on 1 January 2021.

The BBC’s Analysis Editor Ros Atkins examines whether post-Brexit border checks were to blame for disruption at the Port of Dover at the weekend and to what extent.

Leaving the EU single market and customs union will bring new friction and red tape for food importers

The UK asked for an European Union external frontier, similar to the hard borders the EU has with Russia and Turkey, to take effect in Kent.