Middle East Crude-Firm on Iraq, winter

SINGAPORE, Aug 7 (Reuters) - The Middle East crude market held firm on Wednesday, underpinned by Iraq's supply disruption, robust refining margins and the approach of peak seasonal winter demand. Trade for October-loading cargoes is expected to start on a strong note next week, extending a bull run from the last month. "The sentiment is unchanged from last month, a little bullish," a North Asian trader said. "OSP-linked grades will start trading at premiums." Uncertainty over Basra L