John Bridges sent me these shots of what he believed to be a Goshawk, he was most certainly right! And a stunning Goshawk at that, due to the sensitivity of the species in Durham I have kept the location a secret. It's very easy to age this bird, Sparrowhawks at all ages show barring in the underparts, however in Goshawk only the adults show barring on the breast. It is clear to see from these photos the bird is obviously streaked. It is of course hard to sex the bird but it does seem small so I would say a juvenile male. Any thoughts on sex please comment below.