The all cargo flights are DHL who operate a small hub with A300s and B757s, Royal Jordanian with a non peak once weekly Saturday afternoon A310F from Amman. The remainder are Singapore Cargo, Cathay and Korean Air who have had these slots for years and have significant presence at LHR. Other operator is EVA who have off peak slots and until recently JAL. some of Cathay's are VERY peak incidentally.