If the MP stop a sailboat and tow them in, I'm sure they had the rights to stop someone in any vehicle if the skipper seem unreasonable and unprudent. I've seen some sailboats on the lake that seems to be way out of control. Yet the law says they have right of way! Years ago we had one sailor in a 35 footer came across the Broads and smash right into a hugh boulder on our property! The sailor and 'crew' were all passed out! We called the local police who in turn call the MP. The ambulance took everyone to a hospital. The boat was destroyed and they had a barge with a crane remove it. Nothing showed up in the court logs. Looks like they got away with it.