A security guru has revealed some of the tricks pulled by Britain's worst shoplifters - and warned that organised criminals are driving hundreds of miles a day to ransack shelves. Andrew Cockerill, Account Director at Kingdom Security, works with some of Britain's biggest supermarkets , including Tesco - and regularly sees the "traumatising" impact of violent and aggressive thefts on retail workers and security staff. Speaking to the Mirror , he described one disturbing incident in Leeds which