I was at the peak district today, and saw two raptors. One was too far away, and the other was at a distance. The one at a distance, seen through binoculars (but still far away) had all dark upperparts, and underparts, apart from chin/chest (too far away) not particularly long-tailed. Rather robust, so I'm thinking this could be a peregrine? I don't think I will put it down, just get an idea- can a peregrine have all dark underparts from a distance apart from a white chin/chest? Any help would be appreciated, sorry for the vague description.