Some currency pairs are more technical than others. The Pound versus the Dollar has been respecting very well the round number levels lately as we can see on the daily chart. The 1.5500 has no doubt been a very good resistance. A breakout above the 1.5500 level could take the pair to the 1.5600. To the downside we can see that the 1.5400 is currently acting as a support, but that could be temporary and the pair could try to go and visit the 1.5300 zone once again.