Gbp/Usd is in a ascending channel on 1 hour time frame. Major resistance is around 1.4020 which is also the upper bound of the channel. price has already touched the upper channel line 3 times and then come back to the channel. so in my opinion 1.4020 is a good place to short gbp/usd. take profit around 1.3920 the closest support level . and the major support is at the bottom of the channel .