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LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown artefacts flanked by the Dean of Westminster John Hall, left, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbey on December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown artefacts flanked by the Dean of Westminster John Hall, left, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbey on December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown a monk's shoe and other artefacts by Dr Tony Trowles, left, the head of collections, flanked by the Dean of Westminster John Hall, centre, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbey on December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown a monk's shoe and other artefacts by Dr Tony Trowles, left, the head of collections, flanked by the Dean of Westminster John Hall, centre, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbey on December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)

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LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown artefacts by Dr Tony Trowles, left, the head of collections, flanked by the Dean of Westminster John Hall, centre, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbeyon December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 14: Prince Charles, Prince of Wales is shown artefacts by Dr Tony Trowles, left, the head of collections, flanked by the Dean of Westminster John Hall, centre, during his visit to the The Queen's Diamond Jubilee Galleries at Westminster Abbeyon December 14, 2016 in London, England. Works are taking place to build a museum and galleries in the abbey's medieval triforium, running 70 feet above the abbey floor and hidden from public view for over 700 years. The opening is due in Summer 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)