Had a similar experience last night at the self service tills, every other till has been closed to enforce a bit of space between people. Person two tills down needs shop person to approve something and so jumps backwards as they approach. Only issue is she's oblivious to what's behind her and almost stood on my foot she was that close.2m seems to be 2 miles to some of them especially the old dear in front of me who was about 2 car lengths from the person in front. Her situational awareness decreased rapidly once she was in the shop when she was stood pretty much next to anyone who was by the shelf she was browsing.
Then on the way out she's having a natter with the security bloke about how important social distancing is while blocking the exit so other people are having to squeeze past behind her. Apparently social distancing only applies to a 90 degree arc directly in front of you