Oh no -- lured again into the crazy maelstrom of hawthorn berry world...
The surrounding leaves and berries fix this with certainty as a small raptor, somewhere around sparrowhawk size.
Had it not been for apparent lack of barring on underparts, I'd have immediately thought "male sparrowhawk". It really doesn't get close to any other UK raptor species.
Given that there seem to be yellow feet just visible, the grey twig-like object I first thought could be a leg probably is, surprise, a grey twig (covered in lichen?). Doesn't look like a flexible jess to me but guess it's possible.
But there's puzzling stuff. The apparent notch just behind the bill tip shouldn't be there if it's an accipiter but looks kind of OK for a falcon. Perhaps it's damage? The yellow iris shouldn't be there if it's a falcon but looks fine for an accipiter. Why no distinct cere visible? No clear nostril either, although there are some dark blurry bits in the image. Digital artefact? A leaf shaking in the breeze when the image was captured?
The eye looks to be at a slightly more acute angle to the beak than expected in sparrowhawk, hence somewhat "owl-like", but don't know how significant this is. Believe birds can move the eyeball slightly inside the orbit (is that right?), so perhaps it's concentrating hard on potential dinner.
I think the least UNlikely conclusion is that this is a male sparrowhawk with non-typical ventral colouring. In his book on the Sparrowhawk, Ian Newton notes how the ground colour of the underparts can vary to some extent and the shape of darker markings on these feathers. Perhaps there's some typical barring on the upper breast only in which case it could be hidden behind the central branch and foliage?
PS But why, in Jane's enlargement, does it look like its wearing a lace bonnet around its head?