Sterling heads for weekly dive versus robust yen

The pound closed in on its largest weekly fall against the yen in a year on Friday, driven by a strong cash flow into the Japanese currency after authorities in Tokyo hinted at a long-awaited change in monetary policy. Sterling is also heading for its worst weekly performance against the dollar in a month, but was firm against the euro. The yen has risen across the board, particularly against higher-yielding currencies such as the pound and the New Zealand dollar.