JUST BOUGHT A NEW GAS COOKER.THE GAS INLET ON THE COOKER IS ON THE OPPOSITE SIDE TO THE OLD COOKER.ACCORDING TO THE INSTRUCTIONS ON THE NEW COOKER ,THE GAS SUPPLY HOSE SHOULD NOT GO BEHIND THE COOKER.CAN ANYONE TELL ME HOW MUCH A GAS FITTER IS LIKELY TO CHARGE ME TO EXTEND THE EXISTING GAS PIPE...