What appears to have changed in the time lines.
Third primaries were meant to be booked and underway by 11 Sept. There had to be a second instruction with anew deadline of 9 Oct - also widely missed, but many third primaries were done by the end of October. Boosters therefore falling due in April.
I thought that was heralding a cycle whereby the most critically vulnerable (I have one in my household) get 6 monthly boosters in spring and autumn whereas the general population were being done after 6 -ish months, gradually moving to annual autumn shot a la flu
That no longer seems to be the case, as boosters for the 500,000 will be at the 3 month point (so should have been starting December if original deadline had been met - in practice will be mid/late Jan)
Will they have enough gumption to plan ahead for what vaccination regime there should be for critically vulnerable, and for other groups, looking beyond January?
And will they be able to prevent the omnishambles of the third primary rollout from ever happening again?