A look at the pair from a technical perspective….
The UK triggered Article 50. The exit out the EU time clock is ticking.  The GBPUSD fell and then rose to the 200 hour MA and has started to fall again. The price is currently below the 100 hour MA and in doing so, is more bearish. But honestly the action is a bit messy today. There are buyers near the 200 bar MA on the 4-hour chart and sellers against the 200 hour MA (see chart below).