By Johann M Cherian and Shristi Achar A (Reuters) -London’s main stock indices closed higher on Tuesday, tracking an upbeat mood on Wall Street as signs of cooling U.S. inflation spurred hopes of smaller interest rate hikes by the Federal Reserve. The blue-chip FTSE 100 ended up 0.8% after rising as much as 1.5%, while the midcap FTSE 250 rose 1.4%. Wall Street’s main indexes rallied, led by rate-sensitive growth stocks, after a smaller-than-expected rise in U.S. consumer prices raised hopes that the Fed could soften its aggressive stance on interest rate hikes. [.N] Investors are expecting th…