It's the biggest expanse of medieval stained glass in Britain, maybe even the world and it's been described as the English equivalent of the Sistine Chapel. But York Minster's Great East Window is currently covered up for a major restoration project.
That work means some of the large panels of glass that normally tower high over visitors have been brought down to ground level giving visitors a unique chance to see them close up. The finishing touches are being made to a new exhibition and James Webster's been for a preview.
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