You are over on the other side of the pond, could you get away with any kind of pyrotechnics? The AMA has outlawed it here (something about being able to launch rocket powered projectiles at high velocities that could rapidly decellerate against ones vital bodily parts, lol). We got some giant smoke tubes, called mammoth smokes, and were going to put them on the wingtips of a 1/4 scale cap, but were afraid of the repercussions, not to mention the extreme fire hazard and drought conditions we had last year. Although if our field had gotten scorched, it might get rid of those pesky briar bushes that seem to reach out and grab brand new covering. They never go after your old, ugly plane, they go for the brand new, took me 400 hours to cover and is all shiny plane.