Asia’s high sulphur fuel oil (HSFO) market firmed on Monday amid a flurry of bids, though downstream bunkering demand was slow after crude prices surged. Strong bidding interest emerged for HSFO on Monday, with the 380-cst HSFO cash differential (FO380-SIN-DIF) climbing to $8.25 a tonne over Singapore quotes. In contrast, there was no bid for …