Our reporter Emma Louise Smart had the joy of seeing Robert Plant play at the Wales Millennium Centre. Growing up, my mother was obsessed with Led Zepplin. Robert Plant was her first love, and as first loves have a habit of lasting a lifetime (musically, anyway), she still plays their records round the house on hard rotation. This meant that growing up, I was pretty obsessed with Led Zeppelin too, and it was with an entirely childish smugness that I…