If you move without checking the availability of childcare why should you expect someone else to be bumped down the list for your convenience?
for insight - our move wasn anything but convienct. WDH was transferred with 2 weeks notice and 2 days between jobs, with no finance towards the move (it was a move or lose situation).
We left a town we loved, in a house we owned to a city we dont know with no support network.
the 2 weeks between the move was spent finiding a rental without viewing, a school fo rmy DD to transfer into and me packing and driving the kids down .

i could call every childcare in australia in the 'possibilyt' we will be transferred there, but that is just silly.