He was walking towards a group of mates in a cafe after parking up, turned around to glance at his bike and saw it disappearing into a side street, never to be seen again. He had a miserable flight home instead of enjoying the tour.
I use the same car park regularly and chain the bike to a concreted in security hoop. But that’s just a mild steel tube and would be easily cut with a builder’s Stihl saw. As would the chain TBH.
It stops joy riders, but tooled up professionals will have it away before anyone notices what’s going on.