 Work carried out in the 20th and 21st centuries included full cleaning of the stonework and the reconstruction of the pipe organ by Klais Orgelbau of Bonn.The stonework of the west front had been subject to natural erosion therefore a process of lime-based conservation was carried out during the 1990s by Nimbus Conservation under the guidance of Professor Robert Baker who had previously worked on the west front of Wells Cathedral.Some of the damage to sculptures had been made worse by the use of Portland cement by previous work carried out in the Victorian era.