It looks as though the failure to display is working. WordPress reported they could see nothing in the calendar where as I could, after checking the calendar it seems that although the default setting is public and the events are set to default they were not public. Setting the events to public has allowed them to display.
The double event is back. The Space Skilling Saturday event is a reoccurring event, it seems that when I alter just one of these because the location has changed WordPress sees 2 entries in the calendar for some reason. Looks like I may have to create each event separately. How rubbish is that?