Looking at the peregrine pics., it occurred to me that as we have a flat roof on our house extension, would it be an idea to put up some kind of nest site for the likes of (I think) herring gulls? O.K. I know they're not everyone's cup of tea but as they're in decline, I guess they could do with a bit of help and as we do have quite a lot of them, usually on Sundays when the car-boot sale is on in summer, a flat roof might make a decent nest sight. We are, however, very high up and have pretty strong winds so keeping a frame in place for pebbles or gravel might be a problem.
You could certainly try it and I think if it's big enough and deep enough the wind wouldn't move it.
I know Oystercatchers have been known to use them on roofs, don't know if you get them in your area though.
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