the roof, a 10% chance that the fire was caused by arson, and a 10% chance that the fire was caused by an electrical fault. Some traditionalist Anglicans suggested the fire was a sign of divine displeasure at the recent consecration as Bishop of Durham of David Jenkins, whose views they considered heterodox. A repair and restoration project was completed in 1988 at a cost of £2.25 million, and included new roof bosses to designs which had won a competition put on by BBC Television's Blue Peter programme for children. The roof trusses were rebuilt in oak, but some were coated with fire-retardant plaster. 2002 West Door renewal In 2002, the carvings round the great west door. which had become severely weathered, were replaced with new sculptures carved by Minster masons to designs by the sculptor Rory Young, telling the Genesis story. 2007–2018 renovation In 2007 renovation began on the east front, including the Great East Window, at an estimated cost of £23 million. The 311 glass panels from the Great East Window were removed in 2008 for conservation. The project was completed in 2018. Schools There have been choir schools associated with the Minster since the 7th century. A 'song school' was founded in 627 by Paulinus of York, the first Archbishop of York. Buildings used by the former Minster school have been awarded listed status, among them the school house built 1830–33, two houses dating back to 1837, and a Georgian building of 1755. Architecture of the present building York Minster is the second-largest Gothic cathedral of Northern Europe and clearly charts the development of English Gothic architecture from Early English through to the Perpendicular Period. The present building was begun in about 1230 and completed in 1472. York Minster is the largest cathedral completed during the Gothic period of architecture, Cologne Cathedral only being completed in 1880, after being left uncompleted for 350 years. It has a cruciform plan with an octagonal chapter house attached to the north transept, a central tower and two towers at the west front. The stone used for the building is magnesian limestone, a creamy-white coloured rock that was quarried in nearby Tadcaster. The Minster is long and the central tower has a height of . The choir has an interior height of . The north and south transepts were the first parts of the new church to be built. They have