The battered Japanese yen traded near a 32-year trough to the dollar at 149 yen, putting the major psychological barrier of 150 in focus.
ING expects now a 75 basis-point rate hike in November rather a full-point move expected before the fiscal policy U-turn, Smith added.
The euro was volatile weakened against the dollar following German investor sentiment data, which albeit less pessimistic than expected, still painted a bleak picture of Europe's biggest economy.
The dollar index which measures its performance against six major currencies, including sterling, the euro and the yen - was last down 0.1% at 112.00.
Britain's policy U-turn saw the risk-sensitive New Zealand dollar surge more than 1%, already lifted by hotter-than-expected consumer inflation data, boosting bets for further rate hikes.