//...even if it was a million which I doubt very much//
When the settled residency scheme was launched in March 2019 for EU citizens who want to remain in the EU after Brexit, it was estimated there were 3.7m EU citizens living in the UK. It was thought around 3m of them would apply for settled status. By 31st May 2021 over 5.6m applications had been received. It is believed that there are still many EU citizens living here who have not applied under the scheme (hence the calls to extend the deadline) and estimates put the total at between 6m and 8m. So the government's estimates of those who actually are here are out by at least 2m and that figure may be as much as 4.3m. This, of course, is just EU citizens. It does not account for those who have arrived who are not from the EU.
At present the figures the government publish have shown that some 38.3m people have had both jabs. They say this represents 72.5% of the adult population, so the adult population figure used must be 52.8m. If that figure is 2m out and is actually 54.8mm then the takeup is only 69.8%. If the error is at the upper end of the suspected range and the adult population is actually 57.1m, then the takeup is only 67.0%. At the current rate of first dose takeup it takes over three weeks to vaccinate 1m people.
So these figures are significant and demonstrates that the general malaise exhibited about not knowing or caring how many people are in the country is irresponsible to say the least.