BRITISH PETROLEUM COMPLETES STANDARD OIL MERGER British Petroleum Company PlC <BP.L> has completed its merger with Standard Oil Co of the U.S. <SRD>, raising its holding to 100 pct from 55 pct, BP said in a statement. The acquisition was made through BP's wholly-owned subsidiary <BP America Inc>. BP took a 25 pct stake in Standard in 1970, raising its stake to 53 pct in 1978 and 55 pct in 1984. BP chairman Sir Peter Walters will be chairman of BP America, while Robert Horton is to be vice-chairman and chief executive officer, with Frank Mosier as president. BP said further details would be released on July 21.