Half of retailers are considering decreasing staffing levels in the first quarter of 2013 compared with just a third at the same time last year.
New figures from retailers suggest more job losses are on their way after a decrease in footfall.
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A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Counting will begin on Saturday morning, with the result expected later in the day.
There have been a number of incidents involving heavy goods vehicles getting stuck and causing disruption in recent months.