The Harewood House site claims as much...
http://www.harewood.org/grounds/grounds-bird-garden/wild-birds But I doubt it.
At least one former poster on here saw Goshawks in the area a few years ago but I have never seen one in many dozens of visits. You need to head a good way further north to have a good chance of seeing them.
Given the problems of persecution even in areas close to Harewood, with four Red Kites poisoned and an Eagle Owl shot not far away, I would suggest that even if anyone knows better, no details should be posted on here. There are far fewer birds of prey than the habitat of the Wharfe, Aire, and Washburn Valleys should support already, publicity isn't likely to improve that.
I did see over forty Red Kites and eight Buzzards between Bramhope and Eccup today, though.