I finally got this box back up and attached to my PC at about one o'clock. Half an hour later, Box2 had its first visitor - the bluetits in this corner of the garden have always been the keenest when it comes to inspecting a new bird box.
Well, that's what I thought at the time, but when I came to look at the outside camera's record I noticed that a bird had gone into the box several times during the morning before I had got the link to i-Catcher set up properly.