Fri 03 Mar 2002Marconi shares fall 57% on earnings warningShares in telecom equipment maker Marconi fell 57 per cent today after the group said its markets have worsened and that uncertainty will drag beyond March 2003.The firm, which has cut thousands of jobs to reduce costs, said today unfavourable market conditions meant it was unable to enter into a new proposed banking facility and would develop a revised business plan in the next few weeks.