Here is the nest (see the red writing) as seen from inside the bedroom.
Here below is the nest from the outside of the house. X is where I took the other photos from; y is the new nest, and z is the remains of the old nest which was occupied in February.
The colouration of the mouth of a young bird programmes the parent to feed it. The yellow "gape" and black spots inside the mouth are part of a pattern which can vary from bird to bird. Baby cuckoos copy the patterning of the host bird's young.
I haven't managed to get the parents at the nest -- they are so quick, and I don't want to disturb them.
Let's hope the young make it to adulthood this time around!