Help with bird of prey ID?

Had a great day at FDL, never seen so many Redwings and Fieldfare, lovely to see - I hadn't realised how pretty the Fieldfare's markings were.  My query is the bird of prey we almost drove past on the driveway in - we stopped to see if there was anything in the bird box on the right, only for mu husband to point out the bird sitting on a haybale pretty much right next to us!  Much panic ensued in grabbing the camera, and then frantic photo taking before it of course flew off just a few seconds later!  Hopefully I have managed to upload the best pics, but wondered if anyone would confirm whether it's a buzzard or a harrier?  My guess was a juvenile buzzard, but whatever it was, we felt very fortunate to have spotted it and manage to capture a few hectic pictures :)