(Common) Kestrel
Falco tinnunculus

Kestrels are a common sight on long motorway journeys where they hover by the side of the road looking for small mammals scared by the passing cars. These are males, as can be told by the blue-grey head.
 

  

  

1-2: The Meadows, Sandhurst, Berkshire, 05/11/2006.
3-4: Shepherd's Meadows, Berkshire, 15/03/2007.