GBP/USD has moved below its support area defined by 1.5829 (15/11/2012 low) and 1.5755 (28/08/2012 low). A support can be found at 1.5637 (16/08/2012 low). Hourly resistances can be found at 1.5827 (25/01/2013 high) and 1.5893 (21/01/2013 high.)
A decisive break of the support at 1.5755 would validate a medium-term double-top (from 1.5829 to 1.6302). The implied downside risk is given by 1.5356.
GBP/USD is moving in a long-term horizontal range defined by the strong support at 1.5235 (13/01/2012 low) and the strong resistance at 1.6302 (30/04/2012 high).