Britain's Most Fragile Treasure
BBC FOUR
Monday 25 February 2019 00:05 - 01:05 (60 mins)
Dr Janina Ramirez unlocks the secrets of a centuries-old masterpiece in glass, the Great East Window at York Minster, the largest expanse of medieval stained glass in the UK. [S]
Britain's Most Fragile Treasure may be available on playback
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