LONDON, June 15 (Xinhua) -- British stocks decreased on Friday, with the benchmark FTSE 100 Index down by 1.70 percent, or 131.88 points, to close at 7,633.91 points.

ROLLS-ROYCE HOLDINGS, an engineering company, soared 7.61 percent, the top gainer of the blue chips. TESCO and RELX increased by 2.00 percent and 0.99 percent, respectively.

OLD MUTUAL, a financial service company, was the worst performer in the blue chips, with its shares losing 5.02 percent. DCC, an international sales, marketing, distribution and business support services group, dropped 4.76 percent. BHP BILLITON, a global resources company, fell 4.51 percent. Enditem