Salisbury Cathedral and Chichester Cathedral, 1402 to 1861) and fallen down; instead, Salisbury became the tallest church spire in the country on the collapse at Lincoln in 1549. The large supporting pillars at the corners of the spire are seen to bend inwards under the stress. The addition of reinforcing tie-beams above the crossing, designed by Christopher Wren in 1668, halted further deformation. The beams were hidden by a false ceiling, installed below the lantern stage of the tower. Significant changes to the cathedral were made by the architect James Wyatt in 1790, including replacement of the original rood screen and demolition
Truro Cathedral work on the central tower and spire has begun. Restoration work is being carried out by W. R. Bedford; Stuart Aston, managing director, said that the problem is the Bath Stone used on the more decorative areas of the cathedral, has not stood up well to the salts and sand in the maritime climate of Cornwall. Erosion of the stonework has left much of the exposed stonework in such a damaged condition that it resembles honeycomb. Funding for the restoration of the tower and spire has been partly met by grants from English Heritage, Friends of Truro Cathedral, the Heritage