The Plaid Cymru leader and Ynys Mon MS joins Felicity Evans and James Williams at the National Eisteddfod to reflect on a career which spans both journalism, politics and a little bit of showbusiness. In a wide-ranging interview he discusses growing up as the son of a musical collaborator with Dafydd Iwan, the four big decisions he's had to make in his political career - and the records he would take to a desert island.