So kids are due to go to ex's tomorrow for a few days. He called me last night and told me that at the weekend he'd cycled down to see his girlfriend and her family (68 miles away) and then got the train home the next day. He expected me to be fine about this. I am furious and I am wondering if I am within my rights to stop visitation. We are in the process of a divorce (long story, guess why!) so nothing legally written up about kids. Even if visitation continues, is it unreasonable to stop the kids going this week?