To mark St David's Day, Aled Jones returns to his native North Wales and travels through the Vale of Clwyd to meet an alpaca farmer, a shopkeeper who sells everything Welsh and a local historian who explains why the Welsh Bible helped to preserve the nation's language. Britain's smallest ancient cathedral, in St Asaph, is the setting for this week's hymns including Guide Me O Thou Great Jehovah, Let All The World and We Have A Gospel To Proclaim and there's music by Welsh composer Karl Jenkins performed by the Flintshire Senior County Youth Choir and Harp Ensemble.