[user104658]

Originally Posted by All The Jingle Ladies

but surely they would call and rebook?

Would probably still be logged as a no-show for the original date even if they rebooked and got the vax a week later. Same as any other NHS appointment - it's a missed appointment unless you cancel in advance, even if you get another appointment the next day. I doubt many would bother cancelling a vaccination appointment in advance. I don't know if there's even a way to do it?