5.—(1) One or more concurrent writs may, at the request of the plaintiff, be issued at the time when the original writ is issued or at any time thereafter before the original writ ceases to be valid.
(2) Without prejudice to the generality of paragraph (1) a writ for service within the jurisdiction may be issued as a concurrent writ with one which, or notice of which, is to be served out of the jurisdiction and a writ which, or notice of which, is to be served out of the jurisdiction may be issued as a concurrent writ with one for service within the jurisdiction.
(3) A concurrent writ is a true copy of the original with such differences (if any) as are necessary having regard to the purpose for which the writ is issued.