Salisbury Cathedral restores stained-glass treasure by Edward Burne-Jones and William Morris

Close-up of before and after detail of stained-glass window depicting a ministering angel. Burne-Jones designed the angels, Morris the decorative leaf design. Photograph: Cassie Dalby

Sam Kelly admitted there had been some nights of broken sleep as he led a two-year project to restore one of Salisbury Cathedral’s treasures, a stained-glass window by Edward Burne-Jones and William Morris.

“It would be wrong to say I didn’t lie awake sometimes,” said the head glazier. “You are working on something that is very precious and if it fell on the floor, it would be very bad.”