There's a live webcam on Derby Cathedral so you can watch the chicks grow up when they are born and then if you're lucky watch them fledge.
Last year I went a few times to Derby to have a look at the Peregrines (I had never seen them before). The first time I went I saw the parents, and the 2 young they raised in the ready built nest. The second time I went one of the young had fledged, yet only to the front of the Cathedral yet was quite close, the other stayed at the nest site. I did get some reasonably good pictures, not fantastic pictures I admit.
This picture was of the juvenile at the front of the Cathedral.
Here is the other juvenile which is still at the nest site.