The Criminal Justice System has a website which enables anyone to hear the facts of a case, and then encourages you to make the decisions that a magistrate does along the way.
I would encourage everyone to have a go, it really puts into perspective what sentencers go through and how they reach a sentence.
When you have done it, what did you think, was the sentence that was actually given out harsher or more lenient than you gave (it tells you)?