By Amal S and Shashank Nayar (Reuters) -London’s FTSE 100 ended higher on Wednesday as higher yields and upbeat earnings from insurer Prudential aided financial stocks, while a drop in oil prices helped allay some inflation and economic growth concerns among investors. The blue-chip index FTSE 100 rose 3.3%, with banks, insurers and automakers leading gains. Bond yields rose across the spectrum – the longer end 30-year yield rose to its highest since May 2019 and the shorter end 2-year yield gained for the third straight session – helping banking shares rise 5.4%. Prudential jumped 8.6% and wa…