In readiness for the possibility of another Peregrine family on the spire this year, Wakefield Naturalists' Society have already turned on their nest box webcam! http://wakefieldnaturalists.org/?page_id=2415
The peregrine is a large and powerful falcon. It has long, broad, pointed wings and a relatively short tail. It is blue-grey above, with a blackish top of the head and an obvious black 'moustache' that contrasts with its white face. Its breast is finely spotted. It is swift and agile in flight, chasing prey. The strongholds of the breeding birds in the UK are the uplands of the north and west and rocky seacoasts. Peregrines have suffered illegal killing from gamekeepers and landowners, and been a target for egg collectors, but better legal protection and control of pesticides (which indirectly poisoned birds) have helped the population to recover considerably from a low in the 1960s. Some birds, particularly females and juveniles, move away from the uplands in autumn.
Source: RSPB website
You can view Wakefield Naturalist Society's leaflet on the Cathedral Peregrines here.