The GBP/USD made a bullish bounce and breakout above the resistance of the downtrend channel (dotted orange). The bullish breakout could however still be part of a wave 4 (blue) as long as price stays below the Fibonacci retracement levels of wave 4 vs 3 around 1.29-1.30.
If the GBP/USD is indeed in a wave 4, then price will bounce at the Fibonacci retracement levels and continue for a lower low. vs 1. A bullish break above the 50% Fibonacci level makes a wave 4 pattern unlikely and increases the chances of a bullish ABC pattern (red) rather than a 123 (purple).