As I posted towards the end of the last thread the notes tab on the weekly NHS vaccination file summarises the basis for the ONS and NIMS population estimates, and the rationale for what is best used dependent on geographic level.
Hence I’ve used the NIMS figure. The calculation is about as simple as it gets. Two data sets identically ordered, one with vaccination number by age band and one with population. I have the highest level of confidence in excel’s ability to calculate a percentage. Indeed having had my first jab some weeks ago I regularly hear Bill in my head which can be a bit off putting at times, however he has said that when I get the second that will introduce the fully automated audio and visual feeds so he won’t need to trouble me anymore. However I digress from the question at hand.....
Back to the more mundane question of population estimates. If the desire is to depict the grass as being just that bit greener then ONS is the one to use at every level. Never mind that we may have over 100% take up for some council age band levels; or upwards of 200% or more for some MSOAs. If it is all about the narrative then inconvenient truths really have no place.
Within the constraints of the MN daily picture limit I’ll look to show some of the key extremes between ONS and NIMS figures, this is mainly London, and within that then mainly in the 16-49 age band; and with some wide variation between boroughs. Hammersmith and Fulham seems to be at the extreme end for example.
Then an abridged version of the graphs posted last night adding an ONS based uptake percentage alongside the NIMS figure. To ensure it does not become so small that it becomes unreadable I will likely use either broader (eg ten year) age bands or maybe just fewer age bands (eg focus on over 50s; 16-49s; and all aged 16+. It will depend what best fits my desired narrative 
If MN, as opposed to time, allows, a limited student impact assessment. My preference is to start with Charnwood, and perhaps somewhere like Lincoln, and / or whichever council area is home to Keele or Royal Holloway, perhaps even Warwick (a field outside Coventry is presumably not within the Coventry city council area). Durham would be another but with County Durham being a single unitary blob council area population would not be relevant. Perhaps the specific Durham city MSOAs though.