'I saw a member of staff leaving with a black eye'

"People were crowding around the palettes where the sale items were. It was getting more heated by the minute and the next thing, at about ten to midnight, voices got raised. The shouting went through the roof, then all hell broke loose.

"They were ripping the plastic off the palettes and people started fighting. One girl, who can't have been more than 16, picked up some advent calendars and flung them across the shop.

I saw a member of staff leaving with a black eye. It was something I would never like to experience again."