There's a term for it: Trial balloon, and Wikipedia lists "kite-flying" as what it's called in the UK. https://en.wikipedia.org/wiki/Trial_balloon https://en.w

There's a term for it: Trial balloon, and Wikipedia lists "kite-flying" as what it's called in the UK. https://en.wikipedia.org/wiki/Trial_balloon https://en.wikipedia.org/wiki/Trial_balloon