(1) In addition to any time limit imposed by any enactment, the judge may refuse to grant relief in any case in which the judge considers that there has been unreasonable delay before making the application.
(2) When considering whether to refuse to grant relief because of delay the judge must consider whether the granting of relief would be likely to —
(a) be detrimental to good administration; or
(b) cause substantial hardship to or substantially prejudice the rights of any person.