Thanks a lot you blokes (all?)
I will spend some time on those web sites gnu and bobad . I do know that some of them "crossed" (in a group) at Niagara, eventually, although on a previous attempt a Canadian manufacturers brand on a hat was sufficent to have them turned back. They had joined up with a bunch of "Day Trippers" from the US but I am unaware as to whether they had had aliaison in this case. It seems that this was a commonly organised ruse by the "Network" in the US.