Josie d'Arby joins 25,000 people at the annual Big Church Day Out in West Sussex, meeting festival-goers, people working behind the scenes and some of the top names in global Christian music performing on the main stage. Music: God, the Father of Creation from St. Machar's Cathedral, Aberdeen This Is Amazing Grace by Phil Wickham Lord for the Years from The Royal Garrison Church of All Saints, Aldershot Heart of Worship by Matt Redman Like a Candle Flame from Derby Cathedral, Derby Nothing but the Blood by Guvna B How Great Thou Art from Llandaff Cathedral.