By City A.M. Reporter Britain and its allies “reserve the right to respond appropriately” after a missile strike claimed by Houthi rebels on an oil tanker in the Gulf of Aden, the Government has said. The Marlin Luanda was sent up in flames after an attack off the coast of Yemen on Friday, days after the latest round of US-UK military action against the Iran-backed group. No casualties have yet been reported. Military ships were en route to assist on Friday as multinational firm Trafigura said the safety of crew on the vessel, which is operated on its behalf, is its “foremost priority”. AGover…