microlight
You must be one of the few GA pilots who have ever seen a microlight air to air. Most GA pilots seem to think they are an optical illusion and ignore them. The ones from Elstree certainly do as they now run their circuit ( About 5 miles across so they will feel at home when they become BA captains you understand) across the top of our strip. I have got with 200 yds of several when taking off but I have never seen one twitch. Plaistows is on the chart and they miss that by about half a mile. Still if ATC have not told you about traffic you can hardly be expected to look out for it can you.!