Dame Penelope Keith concludes her royal tour in Wales. From Caernarfon Castle, site of the Prince of Wales’s investiture 47 years ago this week, to the Pembroke Welsh Corgis adored by the Queen, there are royal connections everywhere. Half a century on from the Aberfan disaster that left 144 dead after a colliery spoil tip collapsed onto the village, Penelope visits the former mining community to pay tribute to the victims of the tragedy. And to ensure this super series ends on a high note, our triple-BAFTA winning host is also serenaded by the male voice choirs of Anglesey and Bangor…