We have a very friendly lady who lives in the same building and, considering I go out for a walk with Alisa at least twice a day, we bump into her quite often. She always stops to chat to us (unless I look too busy / too stressed / about to burst into tears) and she loves to talk to Alisa in the hope that she’ll give her a smile (which she does most of the time). I’ve noticed that the lady quite often says ‘I’ll leave you to it‘ or “I’ll let you get on with it” when she feels she’s been chatting long enough, and I think these two phrases are very useful. And very British!
If you want to know a bit more about it, here’s a great link!
P.S. The picture reminded me of my brother, who was very independent and rather advanced for his age as a child. According to the family legend, he used to finish telephone conversations with our mum by saying very matter-of-factly, ‘Is that everything? I’m putting down the receiver’.