1 Courts of Law in England, Ireland, and Scotland may issue process to compel the attendance of witnesses although not within their jurisdiction.U.K.

If in any action or suit now or at any time hereafter depending in any of her Majesty’s Superior Courts of Common Law at [F1the Royal Courts of Justice] or [F2Belfast], or the Court of Session . . . . . . F3 in Scotland, it shall appear to the court in which such action is pending, or, if such court is not sitting, to any judge of any of the said courts respectively, that it is proper to compel the personal attendance at any trial of any witness who may not be within the jurisdiction of the court in which such action is pending, it shall be lawful for such court or judge, if in his or their discretion it shall so seem fit, to order that a writ called a writ of subpoena ad testificandum or of subpoena duces tecum or warrant of citation shall issue in special form, commanding such witness to attend such trial, wherever he shall be within the United Kingdom; and the service of any such writ or process in any part of the United Kingdom shall be as valid and effectual, to all intents and purposes, as if same had been served within the jurisdiction of the court from which it issues.