The GBP/USD pair is about to trigger a head and shoulders pattern on the daily chart, after rejecting the 50% Fib level of the April '18 - December '18 impulse move.
The pattern projects a fall of around 450 pips (around 3%), which aligns with the December 2018 low of 1.2500.
Bear in mind that upcoming Brexit developments may increase volatility and intraday noise in the pair.