Sterling dipped from a three-week high versus the dollar on Wednesday ahead of the release of UK growth figures expected to show the economy contracted in the final quarter of 2011. Economists forecast a 0.1% GDP decline, fueling speculation the Bank of England will announce more monetary stimulus at its next meeting. Minutes from the latest BOE policy meeting, also due Wednesday, are expected to confirm a dovish tone. Analysts said the pound is vulnerable to selling on weak GDP data and dovish BOE signals, but downside may be limited as bad news is already priced in.