I wish I could share your optimism...
With Giga Berlin hitting roadblocks, even if orderbook opens, Shanghai's RWD will go to UK for a foreseeable future. Giga Berlin will most likely do nothing until mid December at best. You can thank the otherwise efficient German politicians for that. Apparently the open forum for citizen concerns will take until the 22nd of November since it had to be redone and the analysis and response will take some time (people who claim this is the German ICE industry lobbying delays will if course be called out for having conspiracy theories - but isn't it peculiar, the timing?)
Until final approval comes in (early December unless politicians find another reason to stall) nothing will come out. Xmas is a big thing in Germany. So don't expect people to work that much during holidays. This puts production in second week in January. With the backlog from UK, and rest of EU, nothing will happen Q1 in Australia as Shanghai will send everything west.
China labour is far cheaper... So EU benefitting from Berlin is huge deal. UK not so much. Hence Shanghai RWD will be earmarked. For UK.
That's what I've heard...