The London Metal Exchange is poised to deal with a loophole in its warehousing rules, exposed after commodity trader Glencore bought large amounts of aluminium earlier this year, sources familiar with the matter said. But the exchange will have to wait until a complaint lodged by Glencore with the LME on its inability to take fast delivery of the aluminium from warehouses owned by ISTIM UK in Port Klang, Malaysia has been resolved, sources said.