If the current move down in GBP/USD pair is indeed forming wave 3, we could seen a major move down at least to the 161.8 Fib level @ 1.9337 from low of wave 1 @ 1.9599 to the high of wave 2 @ 2.0025.
While we can aim our second target @ 261.8 Fib level @ 1.8912