GBP/USD is trying to bounce near the key support at 1.6693 (see also the 38.2% retracement and the 200 day moving average). Hourly resistances stand at 1.6844 (13/08/2014 high) and 1.6893 (01/08/2014 high).
In the longer term, the break of the major resistance at 1.7043 (05/08/2009 high) calls for further strength. Resistances can be found at 1.7332 (see the 50% retracement of the 2008 decline) and 1.7447 (11/09/2008 low). A decisive break of the key support at 1.6693 (29/05/2014 low, see also the 200 day moving average) is needed to invalidate this bullish outlook.