Stocks flat after retail sales drop

By Francesco Canepa and Lionel Laurent LONDON (Reuters) - Top British shares were left broadly unchanged on Thursday after an unexpected fall in national monthly retail sales offset a bump-up for utilities stocks just two weeks ahead of a general election. While no single party is expected to win an outright majority on May 7, and experts predicting a kaleidoscope of possible outcomes, the stock market has shown few signs of edginess as some investors choose to stay steady rather than cash out o