I think people in general are getting less concerned about privacy. I had a long conversation on my mobile phone with my GP. I was standing against a wall in a busy street and anyone could hear what I was talking about.
Butting in - yes I do it! I usually begin with "sorry to but in but I couldn't help overhearing what you were saying." People don't seem to mind.
As far as being a Gran is concerned I always keep it tightly ZIPPED.
Mysterious hole - help please!
Being quizzed by chemist's assistant in Boots.