Katherine Jenkins joins celebrations at the Roman Catholic cathedral in Arundel, West Sussex, marking the Feast of Corpus Christi. The festivities include a spectacular carpet of flowers and a procession from the cathedral to the castle.Katherine meets the Duke of Norfolk, who explains the legacy of his relative, the 15th Duke, who introduced the beautiful floral custom to Arundel over 140 years ago. And we hear from the flower carpet designer about the symbols in this year's display.Bishop Richard Moth explains the spiritual importance of Corpus Christi, which for Catholics is a celebration of the presence of Jesus in the Eucharist, and Katherine meets some of those participating in the procession, including a child who has recently taken her first Holy Communion.At Arundel Castle, we revisit the time Katherine met a gardener whose faith has been instrumental in her life and work.With music that celebrates the Eucharist and an a cappella performance from vocal harmony group Stellina at Blenheim Palace.