Appeals
If the defendant (person accused of the crime) is convicted (found guilty), they can appeal against the sentence or conviction or both.
If the defendant is convicted in the magistrates' court and appeals against the conviction, the whole trial will be heard again in front of a judge and two magistrates. In this instance, you may have to give your evidence again.
If it is only the sentence that is appealed against, a Crown Court judge will consider the appeal and decide whether to change the sentence or keep it the same.
If the defendant appeals against a Crown Court decision, the appeal will be heard by the Court of Appeal who will either overturn the decision, order a retrial (which means the case has to be heard again), or leave the conviction as it is.