If you are a witness to a crime or you are a victim, you may have to give evidence in court.

Before you do so, you will have to take an oath in court on a holy book of your choice. If you prefer, you can choose to 'affirm' instead - without the holy book. The General Affirmation is: 'I do solemnly, sincerely and truly declare and affirm that the evidence I shall give shall be the truth, the whole truth and nothing but the truth.'

The lawyers may ask lots of questions, but they just want to make sure that all the facts are correct; they're not trying to catch you out. Witness Service volunteers provide support to all witnesses - both prosecution and defence - during and after the trial. They can provide a quiet and safe place to wait before giving evidence, and can arrange for you to visit the court and look around before the trial.

If you are under 17, you may be able to give your evidence through a video link. Remember that you can ask for a break at any time while you give your evidence. Interpreter and disability help is available.

If you were the victim of the crime, you may be entitled to make a victim impact statement.