Out of interest, would they be some sort of high-vis/day-glo sticker, usually stuck to road signs? Just asking, because, I remember seeing mushroom and aarvark/anteater stickers around Colchester in the eighties. Would these be the same thingies?
When I was in 60Sqn in the 80's we used to lead our sections on Canam's (weren't they awful) and we put our mushrooms all along the MSR we were using so the lads in the wagons knew they were going the right way. Other wise we just stuck them everywhere we went to show we had been there. I remember a big hooha when someone climbed the BFBS Tv tower in Munster and stuck one on there on Lionheart