I have been doing a little bit of research into the ageing and sexing of Buzzards (Buteo buteo).  It seems that determining sex is almost impossible, if not impossible.  As is usual with birds of prey, Males are smaller than females but there is a considerable overlap with some individual males being unusually large and other females being smaller than normal, therefore this is not a reliable methof of determining sex.  Buzzards are variable in colour and therefore it is not possible to seperate the sexes by plumage colour or pattern.   Immature birds are said to be more streaked on the breast but I personally would not rely on that as an indicator.  Adult birds have a broad dark band to the end of the tail, broader than immature birds where the tail bars are even in size right through to the end of the tail.  In addition The iris colour of adults is dark in adults and yellow brown in juveniles.

The above bird by this indicator ( both pictures above) is therefore an immature bird. This is the darker bird nicknamed "Murphy" that was photographed last Monday.  The lighter bird "Blondie" photographed on the rabbit this week is also a juvenile judging by the eye colour and also tail bar. See below.