Worcester contained a considerable number of manuscripts which are, among other libraries, now scattered over Cambridge, London (British Library), Oxford (Bodleian), and the Cathedral library at Worcester of today. Remains of the priory dating from the 12th and 13th centuries can still be seen. John Bell's successor as bishop, Nicholas Heath, was religiously much more conservative and Catholic. Civil War During the Civil War, the cathedral was used to store arms, possibly as early as September 1642. Worcester declared itself for the Crown and was quickly occupied by extra Royalist forces, who were using the building to store munitions when Essex briefly retook the city after a skirmish on its outskirts. The Parliamentary troops then ransacked the Cathedral building. Stained glass was smashed and the organ destroyed, along with library books and monuments. The See was abolished during the Commonwealth and the Protectorate, approximately 1646–1660. The bell tower was demolished in 1647 and the building used as a prison in the aftermath of the 1651 battle. Victorian to present In the 1860s, the cathedral was subject to major restoration work planned by Sir George Gilbert Scott and A. E. Perkins. An image of the cathedral's west facade appeared on the reverse of the Series E British £20 note commemorating Sir Edward Elgar, issued between 1999 and 2007, remaining in circulation as legal tender until 30 June 2010. Architecture Worcester Cathedral embodies many features that are highly typical of an English medieval cathedral. Like the cathedrals of Salisbury and Lincoln, it has two transepts crossing the nave, rather than the single transept usual on the Continent. This feature of English cathedrals was to facilitate the private saying of the Holy Office by many clergy or monks. Worcester is also typical of English cathedrals in having a chapter house and cloister. To the north side of the cathedral is an entrance porch, a feature designed to eliminate the draught which, prior to the installation of modern swing doors, would blow through cathedrals whenever the western doors were open. There are important parts of the building dating from every century from the 11th to the 16th. Its tower in the perpendicular style is described by Alec Clifton-Taylor as "exquisite" and is seen best across the River Severn. The earliest part of the building at Worcester is the multi-columned crypt in Norman style with cushion capitals remaining from the original monastic church begun by