Hearsay evidence refers to statements made outside of court that are presented verbally in court as evidence. Under UK law, hearsay evidence is generally not admissible but there are exceptions. Dave's statement to police would normally be considered hearsay but could be allowed as evidence in this case since Dave has moved to Australia and securing his attendance in court is not reasonably practical. The court has discretion to exclude evidence if it would be unfair to the defendant, considering their right to cross-examine witnesses. As a child witness, the key question is whether the child is competent to be understood as a witness. Special measures may be taken to help vulnerable or intimidated witnesses give evidence.