As I've posted elsewhere, this strikes me as unalloyed good news. The Australians have spent a lot of time and effort over the last few years ironing out all the bugs and maturing the E7 into what by all accounts is a superb capability. Building on that, the aircraft is also currently being put through an A$580m upgrade programme, all the phases of which are due to be fully rolled out by mid 2022. Perfect timing. Unusually, we have (and are taking) the opportunity to step in at precisely the right time and benefit from all these hard yards having been done. It will deliver a huge uplift in capability - great outcome. Assuming of course that we don't b*gger it up by insisting on UK customisation (pie warmer aside), but I think that lesson has finally been learned (witness C17 and P8) and I doubt we'll have that problem here.