The vice president of the European Commission has written in the Telegraph warning that the EU will start a trade war with Britain if Boris Johnson overrides the Brexit deal so that British sausages can still be sold in Northern Irish shops. The UK has already acted unilaterally to extend grace periods on Irish Sea border checks for parcels and supermarket goods, and the Telegraph says it understands ministers are also considering doing it for chilled meats like sausages and mince. Any such action would enrage the EU, it adds.