Is this a peregrine?

These photos are all of the same bird seen at Dearne Valley this afternoon. I'm just hopeless with birds of prey.  Not the best photos - a bit far away for my camera but I'm sure one of you will be able to give me a positive id  We thought at first it was a kestrel but now I'm not so sure.   Ta.

See my Flickr photos here

https://www.flickr.com/photos/115745582@N04/