Last year DH and myself witnessed my neighbour being assaulted by another neighbour. We called the police and gave statements. Last night a policeman called at our door and told us we have to appear as witnesses tomorrow. The assault charge is being presented as a racial attack apparently. When we raised our concerns about repercussions to our family/property we were told we have to attend - no excuses. This guy is saying he acted in self defence which isn't what I saw and if found guilty will get a custodial sentence we have been told. My question is what can the court do to me if I refuse to give evidence.