Yes, a couple of times. Again the outcome to these situations can vary dramatically. Thankfully in my personal experience the Police officers I have met with have been sensible and understanding once I have had the opportunity to explain what I was doing. I have however heard all sorts of stories from close friends about meeting officers who were a lot less sympathetic and in some cases they found themselves at the local police stations for a lengthy chat… My best advice is know your rights, be polite and don’t antagonise the situation if you find yourself face to face with the law.