rather than about increasing manufacturing capacity?

They have looked into increasing supply (see the kerfuffle about the Halix plant) but in the end it seems that the process AZ is using scales poorly. (Not sure how many were produced by the SII, probably not much more than that)

I think AZ delivered approx. 25Mi to the UK and 30Mi to the EU. Compare with Pfizer who delivered somewhere close to 300Mi doses already.