Attendees at a hospital's AGM got a surprise when a choir hijacked the meeting with a 'flash mob' sing-along.

Members of the Norfolk and Norwich University Hospital's choir brought some unexpected entertainment to the NHS trust's annual general meeting on Thursday.

The singing group, which was formed last year, were surprise guests at the meeting in the Benjamin Gooch Lecture Theatre when they began their flash mob singing on Thursday afternoon.

Their routine included singing Sing by Gary Barlow.

This video was taken by Valerie Harris.