This is a broad-winged bird in what looks to be powered flight. Those broad wings immediately rule out falcons, as does the pale iris (falcons have dark eyes). This bird is an even dull grey-brown above, with darker bands on the upper tail and more subtle banding on the upper wings. The underside feathers, including the underwing coverts, are densely barred with more spaced, even barring on the flight feathers. Those transverse bars across the breast and the white supercilium should point you to this being an Accipiter. But is it a Sparrowhawk or Goshawk? The slim build and narrow waist, plus long squarish tail and short neck, all imply female-type Sparrowhawk.
KEY FEATURES Fingered broad wings are typical of an Accipiter hawk Broad wings and yellow eye rule out falcons Barred breast rules out harriers and buzzards Slim build short neck and narrow waist and squared off tail Pale eye and pale supercilium