`I've done a bit of copyediting on this article, but there are one or two places where I don't feel certain enough about what's being said to make any changes. For instance: ``The organ was later re-erected in its present position at the front of the north transept. In 1910 William Hill & Son of London extensively rebuilt and revoiced it, replacing the Cavaillé-Coll reeds with new pipes of their own. The choir organ was enlarged and moved behind the choirstalls on the south side. The instrument was again overhauled by Rushworth & Dreaper of Liverpool in 1969, when a new mechanism and some new pipework made to a design drawn up by Roger Fisher was installed.`` Are we talking about two organs here, the organ and the choir organ, or just one?  I've got a suggestion to make as well. I found the Cathedral section a bit difficult to follow without having any idea of the layout of the cathedral. Would it be possible to include a floor plan of the cathedral?     `