Works included cleaning stonework, restoring the Clore Old Library, chancel and nave including 15th Century stalls, and improving access.

BBC: University Church of St Mary the Virgin reopens

"Some of the architecture in the chancel is from 1450 or so, but there are earlier bits dotted about, " Mr Judd said.

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During the chant they walk through the church towards the chancel, the singer carrying a sword in his or her hands, held upright in front of the face, while the altar boys or girls carry candles.

UNESCO: Culture