No. When I first saw them, I was on the fire road climb and they were unloading their bikes and thought I'd go and ask them politely. By the time I reached their van, they were on the very top of the new bit. I got to the top of the new bit and briefly one of them passed by me. I stopped to speak to one of them but they were riding about six feet below me to my right and may well not have noticed I was looking. I continued round to the berm lines and when I was at the top of there, noticed one of them off to my right, about 40 yds away. like I have said, they were not causing me any problems at all and I did wonder whether they had permission so I wasn't going to go chasing them round. I thought I'd ask here first.