I suspect what's happening with the pound is that after all the lime light and hard talking by UK Gov, turning down bank requests for an interval period or some kind of softening the message went out to short sterling to feel the water on level of support. Banks are international and traders do chat.
Untimely coincidence perhaps by the French president remarks over-night the decision to sell sterling met with no resistance. So lots of sell orders nothing on the buy side and algo's kick in, and hey presto!!!
1.28 - 1.32 band feels so far away right now and I would suspect 1.28 will become very strong resistance to any rises.
Unless UK Gov softens stance to finance sector, further lows will be probed.
fwiw - I quiet fancy 1.20-1.25 range next. Hope I'm wrong... :whistling