Hi,
My wife and I had our second vaccination early in April and about a month ago did a blood test to see if we had anti-bodies which we had. We have just been sent another kit so we can take some blood that will be checked to see wether the anti-bodies were the result of contracting Covid or from being vaccinated. I suspect it will be because of the vaccine as both of us are well into our 70's and neither of us have felt unwell, the chances of both of us having Covid with no symptoms I think is remote though neither of us had any reaction to either the injection or vaccine so it might be possible that we had contracted Covid and been very lucky.
Well today is infection day in England and as usual the government is ahead of the game increasing infection statistics itself; though the water has to be tested and maybe in summer rather than winter is a better option. Here in Wales like Scotland there is a more cautious approach, my wife and I will continue with using face masks when we see fit even after the restriction is lifted.
Take care and stay safe.
Tony.