Tesco has launched an investigation into the conduct of two members of staff after a video of them engaging in a sex act in a Norfolk store went viral.

A man and a woman were filmed together in the back office of what is believed to be the Stalham branch of the store in Old Market Street.

Both have now been dismissed.

The supermarket chain commented: 'We are taking this issue very seriously and have launched an immediate investigation.'

The pair appear to have been filmed through a window.