"I've been to several meetings on this particular subject, most of which have ended up in a feeling of great depression, where I think suicide was really the only logical step," Premier Foods CEO Gavin Darby joked at an industry conference in London on how Brexit could affect the UK food industry. "I don't come from that school. There are opportunities in the situation we find ourselves in." Twice in the last fortnight Darby has gone public with his views on Brexit and, as the boss of one of the country's largest manufacturers, his comments will spark debate. Dean Best reports.