 The cathedral is also used as one of the venues for the graduation ceremonies of the University of Kent and Canterbury Christ Church University.Much of the stonework at Canterbury Cathedral is damaged and crumbling, the roofs are leaking and much of the stained glass is badly corroded.The last quinquennial structural review revealed that a combination of centuries of weathering, pollution and constant use had taken its toll on the ancient building and some serious problems were in need of urgent action.