It all becomes clear now.
The man from the CAA phoned back. He asked if I was the owner of the laser display and I proudly said that I was. He had been receiving complaints from pilots bound for Heathrow and Gatwick who had been startled by the presence of a reindeer and a sleigh appearing alongside their aircraft. He asked if the display could be turned off or at least reduced in intensity. Feeling cheerful this morning, I agreed.
I phoned Fellows and instructed him to call the Christmas Organiser and tell him to tune down the lasers. (I suppose this is why you put them under test - to discover any minor problems they may cause). It was at this point that Fellows pointed out that the edge of this morning's metal object was not frayed at all but crisply cut, and could the lasers have actually caught a wing tip? Pondering this I told him to bury the object and not tell a soul.