What type of warrant is issued when a person fails to attend court as a witness?

The correct choice is a witness warrant, which is specifically designed for situations where a person summoned to court as a witness fails to appear. This type of warrant is critical in maintaining the integrity of the judicial process, ensuring that individuals who hold important information relevant to a case can be compelled to testify.

Witness warrants serve to uphold the legal obligation individuals have to participate in court proceedings when summoned. By enforcing attendance, the legal system ensures that all relevant evidence can be presented, thereby facilitating a fair trial. This legal mechanism underscores the seriousness of a witness's role in the judicial process, reminding individuals of their duty to cooperate with the court.

In contrast, an apprehension warrant is primarily used for individuals who are sought for arrest due to involvement in criminal activity, while a means enquiry warrant allows for investigation into an individual's financial status to assess their ability to pay fines or restitution. A revocation of licence warrant relates more to driving or other license infringements rather than witness attendance. By focusing on the necessity of witness testimony, the witness warrant is uniquely positioned to address the issue of non-attendance in court.