@JimmyT said:
… In fact, the best thing Costa could do might be to give the neighbours a cheery wave – that would have most people closing their blinds … if they cared about how much their neighbours could see.
Indeed. This is what happened with my neighbour, except that she asked me to give a cheery wave rather than avert my eyes when I could see her sitting up in bed as I went out to collect our newspaper. She wanted the connection between us. She was a bold, feisty and very interesting lady and a great neighbour.