Video: Vince Cable defends 'grown-up' text messages with Ed Miliband The Liberal Democrat minister has dismissed criticism over text messages he exchanged with opposition leader Ed Miliband. Former Lib Dem leader Sir Menzies Campbell warned the Business Secretary that such communication could undermine the coalition by aggravating already disgruntled Tory backbenchers. But Mr Cable told reporters: "There is absolutely no issue here." I've been open for a very long time, very very occasionally I talk to people in Opposition, indeed right across the spectrum - that's grown-up politics.