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The picture is nice, but does not allow a definite age to be made, I think. Young birds start to lose the dark feathers on the nostrils from about now, but these seem already to be very adult-like and pale on the base of the bill. I suspect that they are adults. The colour of the flight feathers can't really be seen, but would be rather dull in young birds, very glossy in adults. Probably adults, I would say.
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Thanks for that Ian. I wasn't sure at all - it was just a feeling I had! (To be honest, the white at the base of the bill is more obvious in the photo's than it appeared to me at the time)
Lat/Lng: 55.60193, -2.44615
OS grid ref: NT719343