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In 2015 PCA discovered approximately 30,000 small pieces of medieval stained glass in Westminster Abbey, during work to install the new Galleries. Some of these fragments have been integrated into the new windows in that area … and some have been recreated as biscuits by Dr Ella Hawkins! Thanks again Ella.
Read more about the discovery and conservation of the glass here: https://www.theguardian.com/science/2017/dec/27/westminster-abbey-attics-archaeologists-treasure-trove-stained-glass