With St David's Day around the corner, Katherine Jenkins visits Pembrokeshire to meet pilgrims following the ancient trail to St Davids Cathedral. Katherine meets Janet Ingram, who has been leading pilgrimages along the coastline of Wales for over a decade, and finds out how the diocese is celebrating 900 years since the route was officially recognised by Pope Callixtus II in 1123. The group stops at places of significance to Wales's patron saint, including the well where David was baptised as a baby. Along the way, Katherine meets Daniel Jervis, an Olympic swimmer and Christian, who talks about how faith has helped him overcome challenges in sport and his personal life. Also, James Lusted visits one church further north on the pilgrim path, which is undergoing an impressive restoration part-funded by the National Churches Trust. With hymns new and old from St Davids Cathedral and across Wales - and a special performance from Welsh actor and Hollywood star Luke Evans.