James, now why didn’t I think asking U Tube?
Certainly a Buzzard and not an Eagle and could have been filmed in my garden, hole, excavation, pieces of comb fit exactly etc….............!

Hello Nigel,Curiosity got the better of me so I took a look on U Tube. not sure what the bird is but it does seem to be making a meal of the wasps.
http://www.bing.com/videos/search?q=do+buzzard+attack+wasps+nests&qpvt=do+buzzard+attack+wasps+nests&view=detail&mid=5B2F35C44BA662B8641F5B2F35C44BA662B8641F&rvsmid=37D4DB3C8FF5D92A5FB437D

We have had wasp nest at the edge of my Muchelney vegetable garden all summer and it was certainly active till very recently, I have been stung twice as a result!
Last week I was surprised to see a Buzzard lift off from that part of the garden, my only thought then was a new in/on the garden species!
This morning whilst sweeping up leaves I found the nest completely excavated with the comb in pieces spread around the immediate area.
A good square foot had been very cleanly and tidily dug out with not no signs of any mammal footprints in the surrounding area.
Badger was my first thought, though I have never seen a Badger within two miles of here, though certainly many foxes.
If it had been a large mammal I would certainly have expected prints and a less clinical excavation.
Two plus two etc perhaps, but ‘Pernis’ regularly do this so why not ‘Buteo’ - BWP gives insect larva though no details of how obtained, as a regular food source especially on the continent.