Just recently I've managed to get a few photos of different birds that have been visiting the garden looking for something to eat.
Sparrowhawk (2nd year bird?)
Sparrowhawk (adult male?)
The first picture was a bird seen on 3rd March 2015, and is, I believe, a bird born in 2014. The second picture was one that was seen yesterday, and is an adult bird with no signs of any juvenile plumage. Both birds are males.
I also managed to get a photo of a much larger female back in October 2014 (see here), which I also think is a juvenile bird. See this gallery of pictures that can help with ageing this species.