The North Channel is the stretch of water between Scotland and Northern Ireland. At its narrowest, it's just 13 miles wide. Here, Helen Mark explores the stories surrounding the journeys which are made from one side to the other. She meets one of the crew working on the passenger ferries which plough back and forth and learns what life is like for those whose working lives centre around this journey. There have been suggestions for a fixed crossing, either a bridge or a tunnel, for more than a century - an idea recently revived by Boris Johnson. Helen asks an architect whether it could ever really happen
