On Ascension Day, the Thursday forty days after Easter, many churches 'Beat the Bounds'. An ancient ceremony, clergy, young people, dignitaries and local people process around the boundaries of their parishes.  In this episode we hear from three clergy in the City of London, Laura Jorgensen, Rector of St Botolph without Aldgate, Katherine Hedderly, Vicar of All Hallows by the Tower and Roger Hall, Chaplain to the Tower of London, about the origins and meaning of the ceremony.