It's still not adding up very well. Every vaccine I have administered was made in Puurs, Keele, Oxford or Wrexham, none of which are apparently under supply shortage. They are clearly able to produce a decent wadge of vaccines every week, as witnessed by this week, so something is missing here. The source of this story was a letter within the NHS, reporting on what they were told by the arms-length Vaccines Taskforce, the writers don't know the details and tha Taskforce keeps their cards close to their collective chests.

[India sounds more plausible, since that's Joint Venture rather than central AZ but this would have been extra to current throughput].