Can sympathize with you. I have had a peregrine into my youngsters last week Sunday, Monday and Friday. They are nesting on Cox,s Stack, Dundee approx 800 yards from my loft. They took a youngster about 3 weeks ago but last week they missed, but the birds are scared stiff to go into the air. These peregrines have been giving me problems since 2004 but rarely at this time of year it is usually during March and April. Hope you get your young birds back in tact, I know what you are going through. All the best.