Retail sales in London slumped in July after the bombings and attempted bombings during the month, a survey showed today. According to the London Retail Consortium, underlying sales dived 8.9 pct in July compared with same month last year -- the lowest since the series began in 2002. In June, a 3.6 pct rise was recorded. The London bombings hit trade hard on July 7 and 21. Sales recovered a little but continued to be depressed by tube disruptions, numerous security alerts and consumer anxiety, the survey found. The sharp reduction in underlying sales in central London compares with a smaller decline of 1.9 pct for the UK as a whole