@shwell @KimSJ I did it, and the vaccination for the normal population started on 18/01/2021 (https://en.wikipedia.org/wiki/COVID-19_vaccination_in_the_United_Kingdom) It is exactly at the peak, before the numbers started to go down. That means they had nothing to do with the previous increase in cases (how could they have caused something happening one or two weeks before being rolled up?!). But they may be linked to the decrease in cases after and during the rollout. If you see a graph and think something happening at a spike is what caused it, then you really don't understand how cause and effect work.