Mattcouts

Hi My partner and I are moving to Aus (she's an Aussie) in the autumn 2018. We have quite a bit of savings which we are keen to move over to Aus for a house. We will look to buy early/mid 2019 between North Sydney and the Central Coast. GBP/AUD is at a low but clearly it could get worse if Brexit negotiations go badly/ no deal but could do better if we get a decent deal/ not a terrible deal. What I and no one else can do is predict what is likely to happen but I am interested to know if anyone has been in a similar situation and what strategies you used to move money over, did you do it in stages, wait for the uptick, do it in £5000 chunks?... any/ all ideas welcome. Thanks Matt