A number of sites around the UK are favoured by Peregrine Falcons at nesting time.
These tend to be the spires/towers of cathedrals and churches and ledges on other tall buildings.
The County Council HQ in Aylesbury has had Peregrines nest there for several years but unfortunately the webcams are not working.
I had the good luck to see one 'in the flesh' last year over the town centre and I was surprised at the size of it. I had assumed that they were Sparrowhawk size.
However, the webcam is working at Chichester Cathedral in Sussex and is worth a look.
Link to live stream.
www.chichesterperegrines.co.uk