It was ordered after the Mayor heard concerns of traders from Queens Market in Newham, who fear their stalls will disappear after a planned redevelopment of the area.

Mr Johnson also pledged to visit the market and see the area for himself. He announced the study into whether existing planning policies support London's street markets during Mayor's Question Time. He said: "I am determined to support street markets, [they are a] wonderful part of London life and can bring great benefits to local communities and those on low pay."

A string of London markets are fighting for survival against threats including increasing rates, loss of trade due to the C-charge, redevelopment schemes and the influx of chain stores. The Evening Standard's Small Shops campaign has been calling for more protection under planning laws for all independent traders, in order to preserve the individuality of London's high streets.