Could not be part of the reason for.the rate of vaccinations reducing be simply the fact that there are now far fewer people to vaccinate?
We're up to 86% of the adult population having had their first, and even in their wildest dreams I don't think the ptb thought there would be such a high uptake.
Plus we're at the point now where they decided to bring the 50+ 2nd jabs forward so there were fewer first jabs.
I would imagine that unless they bring jabs even further forward (which may well happen, in fact I'm expecting it to happen as we get 90%+ first jabs), that it will be at about the same numbers for the next couple weeks until everyone (who wants one) has been jabbed.