Hi Leon, and all the people who have so far posted.
I'd like to add my little piece in as well. The bird books mentioned are all good. I like the Simpson and Day, myself.
What has not been mentioned is that juvenile birds may look very different to the parents sometimes. To identify them becomes somewhat more difficult.
Be aware that it can happen. An example is the Pied Butcher Bird. I had a number of them visiting my back yard. (2 acres) One juvenile was brown while the rest were grey. After the moult they were all bright white and shiny black.
Cheers