Hopefully I'll be able to confirm that they have chosen the nestbox in the next couple of days ....
How exactly do you confirm this, TPC? 
I open box, look in box. If eggs are present, Princess & Ivy have chosen the nestbox 
Actually that is pretty much how it goes everywhere, you can't be sure who's going to nest where until they actual lay their eggs. I don't even like to count my eggs until they hatch ...
I know that my question may have sounded rather simplistic, TPC, but being a relative "newbie", with lots to learn still, I had actually wondered if there was some way you could tell that they had chosen the nestbox, by looking at the scrapes or something else. I did not really know that this can only be confirmed by actually seeing eggs in the nestbox. 
So I guess we'll just wait to hear from you, after you and Dennis have had a "look-see"!
Your question was far from simplistic Kinderchick, but the answer is. We can watch their behaviour and check all their favourite spots but with the Radisson birds, it really has been a case of one day there is an egg in the box or on the nestledge. Last year, they were hanging out on the west side enough that we really thought there was a real chance they would nest in the box, but then suddenly we had an egg, then another, and a third and then a blizzard, then a fourth, then the ice-storm arrived and then when we say the eggs a week later we were back down to three. So most of the time, its zoom onto the nestledge and there's an egg or open box, look in box, egg in box
Just like last year, they visited the box often and had made a couple of scrapes in the gravel by this stage, but in the end they chose the ledge!
