Black bean, chargrilled corn & feta tacos

A couple of months after I was diagnosed as a Coeliac I woke up from a nightmare. I was in hospital and two nurses had brought me a tray of plastic-wrapped cabin bread (presumably gloof), ‘We’ve got bad news for you’ they said. ‘As well as being Coeliac, we’ve discovered that you’re also vegan’. I jolted awake, sweating and heart…