GBP/USD has broken over the 200 day moving average and trend-line resistance off 1.6167. However, structure present since 1.5649 suggests that the 1.6000 region should act as strong resistance, with scope then for a fresh swing back down to 1.5700/50.
The 1.6000 region also lies close to the 50 week moving average, which acted as a region of resistance at the end of last year.
Loss of the reaction/swing low at 1.5645 would confirm a top pattern calling for a return to 1.5500/1.5582 (psychological/50% retracement) in a deeper retracement of the 1.5235 advance.