I wondered earlier today if those people who have tested positive and are now recovered, and those who have now vaccinated will have started changing their habits? I can imagine a certain amount of 'it's safe for me to pop to someone's house, as I've already had it/am vaccinated'.
Anecdotally, is anyone seeing this? I can't say I am, but we've had very low incidence locally (rural). I can easily imagine it happening though.