Vaccine roll out.

"Jab" doesn't seem to be a particularly new expression for a vaccine in South Yorkshire - I was definitely living in fear of my TB jab almost 30 years ago! I've not heard any of my old folk refer to them as "jags" either (and it does come up as a regular topic of conversation in my line of work!).

"Two Jags" was John Prescott, but didn't it get changed to "Two Jabs" after the rumble in Rhyl?

Thats what a jab is to me Proserpina, a short fast punch with a fist, a jag is something you get from the likes of a thorn or a skelf or again a needle, such as the instrument used for injections