My wife and I had booked the Glasgow Street Art Walking Tour on May 22 when our cruise ship was docked in Greenock. When we exited the ship to seek bus and train transportation to Glasgow (approximately 25 miles), we learned that transportation services were being disrupted due to strike action. With the afternoon tour, we felt uncomfortable that we could count on getting back to the cruise on time so I sent an email to the tour operator to explain the problem. I was aware of the 24 hour requirement for notice of cancellation but I was hoping that some consideration would be given to our request for a refund under these circumstances. We have dealt with Viator on other tours including on this cruise. Unfortunately, their response was basically "rules are rules" so we are now ex-Viator customers. The tour looked interesting but not impressed with their response either.