By Johann M Cherian and Shristi Achar A (Reuters) -London’s main stock indexes fell on Tuesday, tracking a weak session on Wall Street after strong U.S. data fuelled fears about aggressive rate hikes by the Federal Reserve. The export-oriented FTSE 100 fell 0.6%, marking its biggest percentage loss in over three weeks, while the domestically focused FTSE 250 dropped 1.2%. New York’s benchmark S&P 500 tumbled over 1% after the chief executive of top U.S. bank JPMorgan & Chase warned of a mild to more pronounced recession ahead, a day after strong U.S. services sector data fed into fears of a lo…