By Sruthi Shankar and Bansari Mayur Kamdar (Reuters) -London’s FTSE 100 index ended the week lower on worries about aggressive interest rate hikes and a sharp slowdown in the global economy, even as energy and defensive stocks lifted the benchmark index more than 1% on Friday. The FTSE 100 added 1.7%, supported by energy giant Shell, AstraZeneca and British American Tobacco. The domestically focussed FTSE 250 index gained 1.9%. “Some of it is definitely down to investors buying the dip, and some of it is also down to the latest sort of update from the Fed,” Danni Hewson, financial analyst at A…