You can always tell when economic events come in unexpectedly on the markets, otherwise the 3 cent shift would have happened gradually over 2 weeks, rather than a single morning of trading. UK markets are not even open yet, but trading in time zones ahead of us have already boosted GBP/AUD rates up to 2.13, but have since settled to 2.12.
The reason for this is the surprisingly cautious action taken by the Chinese, who are now actively attempting to devalue their currency. This is a measure to protect their economy from its current slowdown. Historically, China has compensated against any signs of stagnation through increased state spending (usually domestic infrastructure). Such a significant change in policy suggests diminished reserves of state capital.
If the Chinese do not have the reserves to spend internally, then forecasts for external spending on imports are hit just as badly. Hence the AUD weakening immediately in just a few minutes.
Surprises like this are few and far-between. I am still inclined to believe that rates will likely recovery, and have been in recent weeks until this overnight announcement. Those looking for a quote on GBP/AUD transfer should call 01494 787 478 and ask for Joshua to receive a free quote and tailored advice on your situation. email@example.com