In case you haven’t read it already, here is an article on Bloomberg with the talk of ‘sterling crisis’ which was enough to get traders thinking about why they were sitting long sterling. My guess is that the only reason for being long was “because it’s going up Guv’nor”.
Heavy stops are tipped in the cable below 1.6410 but the buying interest around 1.6420/40 looks pretty solid. My tendency today, after such a big fall overnight, is to trade with a bearish bias. My trading range for the Asian session is 1.6420/1.6545.