Thursday 30 June 2016 , 1 GBP = 1.788 AUD, GBP AUD rate for 30/06/2016.
Wednesday 26 October 2016 , 1 GBP = 1.581AUD, GBP AUD rate for 26/10/2016
As the UK is not open for business at the moment (Due to early hours of the morning) the shift in FX movements reduced net debt by $5M or so.