Britain's top equity index edged lower on Tuesday, with Rolls-Royce falling for a second straight session after an earlier profit downgrade while weak metals prices weighed on mining shares, Reuters reported. The FTSE 100 index was down 0.1 percent at 6,531.96 points, having fallen 0.8 percent in the previous session after Greek voters rejected austerity conditions imposed on it as part of a bailout programme. Rolls-Royce fell 3.6 percent, extending a 6.3 percent drop on Monday after the company cut profit forecasts, as investment banks Natixis, Investec, Bernstein and RBC all reduced price targets on the stock. Rolls-Royce was the worst-performing FTSE 100 stock in percentage terms; chipmaker ARM was the best. ARM rose 2.8 percent after Morgan Stanley raised its stance on the stock to "overweight" from "equal weight" and added the company to its "best ideas list". Mining stocks declined after copper prices fell to a five-month low, amid concern about economic growth in China, the world's top metals consumer. The FTSE 100 is down by nearly 1 percent since the start of 2015, and some 8 percent below a record high of 7,122.74 points reached in April.
