Travellers arriving into Britain next week could face border delays following a strike announcement by immigration officers. ISU (Immigration Service Union) members will walk out for 48 hours from midnight next Thursday following a dispute over rosters, which will create long queues at air, train and sea immigration. “A walkout by more than 4,400 immigration officers threatens to wreak havoc, irrespective of any contingency measures adopted by the UK Border Agency,” the union said. “It will have a major impact on anyone hoping to travel to Britain by sea, Eurostar or air,” added the union’s Vice Chairman Stuart Band. The union, which represents 85% of immigration staff, expects the majority of members to take industrial action.