GBP/USD has just broken the channel in the long term, confirming the current decline. If the momentum continues, the main support levels for monitoring Fibonacci are:
1,2809 (Fibo 0.382): The first closing support level.
1,2662 (Fibo 0.618): The important support level, may have a stronger purchase force.
1,2425 - 1,225 and 1,2042: Lower target if the decline continues.