Vfrpilotpb said: "I have seen the big Royal Navy Helis do this in the past , but never any civvie one's, sound a tad riskkkeee!"
Sorry to hog the thread, but I have an air to air photo I took over Leeds in (about) 1971, where we flew a White Ensign and a Leeds flag under a couple of Wessex (Wessie??). No idea what we used as weights, or how the concept came about or was tested, but there is certainly nothing new under the sun