Yes, somebody forwarded me the link yesterday, just after my GP had rung:
https://www.nhs.uk/book-a-coronavirus-vaccination/do-you-have-an-nhs-number
I was surprised, because I hadn't heard over-60's (in England) now are on a free-for-all. Not at all sure the same is true for Wales, and I haven't seen that officially yet either. People were exploiting a loop-hole that way at one time, where the "authorities" somehow imagined that if they only sent the link to those who qualified, it wouldn't get into the wild. I presume they will now throw you out of the application if your NHS number doesn't qualify.