I was undecided whether to visit the nest today, I thought it might be better for the birds if I left them for a day or so just in case my presence is causing any pressure, which frankly, I doubt. However, I succumbed in the end but just spent a very short time in the area, long enough to check that they are still building and everything is well. I checked to see if she has laid but not yet, this is a surprise. My impression was that she would have by now. As I sat there, the female did a walk up to the nest carrying a leaf which she "softened" by shaking in the way that I had observed the other day.