Thanks @Gothnet - fingers are well and truly crossed. All our stuff went yesterday, travel declarations all done, G2G pass updated. Just got to find some one way travel insurance as my annual one doesn't cover migration.
Just to scare the shit out of us, I saw the first cancellation from SQ223 on facebook earlier. 30th September. We fly next week so hopefully they are working on date order and we are ok. There is no plan B now.