In other news: there are now at least 8 chicks on the ledge. Pairs B, C, E, H, I, N(possibly), Q and S all have chicks. Pairs A and M have no chicks or eggs. Pair G and possibly pair F are still sitting on eggs, and I'm still not sure about pairs O, P and R.
There were 5 feeds during my 2 hour survey this morning. Chicks B, I and S were fed once, and Chick F was again fed twice.
More news tomorrow.