"Drop-in covid jab"

Waited a little over an hour this morning for it to be my turn. When I got to the person giving the jab, they first called me "sir", which was slightly odd as I look nothing like a man. Looked up my info and noted that I had an appointment for this jab in a couple weeks time, questioned why I was there. Then said they had to go check on something. Came back and explained they had to see if the jab could be given as it had "only been 8 weeks", which yes...8 weeks is what we are being told is the new wait period between AZ vaccinations...hence why I was there.  A remark was made about others missing out or having to wait hours in the sun which seemed to me was suggesting I was jumping the queue or somehow unfairly taking my second shot ahead of time. I thought I was doing the right thing by dropping in and freeing up my appointment slot for someone who can't drop in or stand in a queue for hours. They gave me the jab and sort of waved me towards the exit. 

I feel like the messaging people are getting from NHSGGC twitter and the website needs to either be clarified (if I was indeed in the wrong for showing up today), or the people doing the vaccinations should be kept informed of changes to the policy. The nurse was a bit rude with me and I left feeling bad, whether she was right or not.