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Britain's Most Fragile Treasure

Duration: 59 minutes

on BBC Four

Available for 7 months

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. Show more

BBC Four

About BBC Four

BBC Four reflects arts, music and culture with an ambitious range of intellectually and culturally enriching programmes, taking an expert and in-depth approach to its subjects.