By Chris Hughes & Ashley Cowburn The RAF’s second bombing blitz on Houthi rebels was self-defence, Rishi Sunak said on Tuesday as British bases were put on high alert for a backlash. Four UK Typhoons joined US forces to smash targets in Yemen on Monday night after attacks on shipping in the Red Sea and Gulf of Aden continued. Prime Minister Mr Sunak vowed Britain would not hesitate to launch further air strikes against the Iran-backed Houthis unless they stopped. Mr Sunak said: “We are not seeking a confrontation. We urge the Houthis and those who enable them to stop these illegal and unaccept…