floodlighting was added in 1975. A major survey in 1974 revealed new leaks, decay and other deterioration, and a ten-year restoration plan was agreed. Again the roofing required much work. The nave and clerestory roofs were repaired in four stages with new leading. The nave project was completed in 1984 at a total cost of £1.75 million. The clerestory windows were repaired with the corroded iron replaced with delta bronze and other Grimthorpe work on the clerestory was replaced. Seventy-two new heads for the corbel table were made. Grimthorpe's west front was cracking, again due to the use originally of too strong a mortar, and was repaired. A new visitors' centre was proposed in 1970. Planning permission was sought in 1973; there was a public inquiry and approval was granted in 1977. Constructed to the south side of the cathedral, close to the site of the original chapter house of the Abbey, the new 'Chapter House' cost around £1 million and was officially opened on 8 June 1982 by Queen Elizabeth. The main building material was 500,000 replica Roman bricks. Other late 20th-century works include the restoration of Alban's shrine, with a new embroidered canopy, and the stained glass designed by Alan Younger for Grimthorpe's north transept rose window, unveiled in 1989 by Diana, Princess of Wales. In 2015 seven new painted stone statues by Rory Young were installed in the medieval niches in the nave screen. This was a rare occurrence as the last painted figures placed in a church screen were put there before the Reformation and the English civil war. 21st century The shrine of St Amphibalus was restored between 2019 and 2021, funded by a grant and the contribution of over a thousand donors. Due to be unveiled in 2020, work was delayed due to the Covid pandemic, and a new figure wearing a face mask was added to commemorate this. Modern times The bishop of St Albans is Alan Smith, installed in September 2009. Jonathan Smith is Archdeacon of St Albans, installed in October 2008. On 4 December 2021, Jo Kelly-Moore became the tenth dean of the cathedral. Robert Runcie, later Archbishop of Canterbury, was Bishop of St Albans from 1970 to 1980 and returned to live in the city after his retirement; he is commemorated by a gargoyle on the cathedral as well as being buried in the graveyard. Colin Slee, former dean of