The British pound sterling (or GBP) has fallen precipitously recently, not just against the U.S. dollar (which has clearly out-performed against practically all currencies). GBP has fallen too against even the euro (EUR/GBP has risen sharply), as well as the Canadian dollar (or CAD). It has however found some degree of support against the Australian dollar and New Zealand dollar (AUD and NZD, respectively).
(Chart created by the author using TradingView. The same applies to all subsequent candlestick charts presented hereafter.)
The GBP has found some support against AUD and NZD only because