Posted: 09/03/2016 at 18:55
I've always found that once the eggs are laid and brooding has commenced the birds are pretty tolerant of comings and goings. However, if their investment in the nest site hasn't been so great then they may well move and find another site if disturbed too much. But of course no one would intentionally disturb them - apart from any other reason, it's illegal.
Bluetits have been popping in and out of the nestbox on the trunk of the ash tree on the Shady Bank. I think the robins, wrens and blackbirds are nesting in the neighbours' huge laurel hedges.