Supreme Court Rules 2000

An affidavit which has, either in the body or the jurat, any addition, alteration or erasure is not to be used without leave of the Court or a judge, unless –

in the case of an addition or alteration, it is authenticated by the initials of the person taking the affidavit; or in the case of an erasure, the words or figures appearing at the time of taking the affidavit to be written on the erasures are rewritten and signed or initialled in the margin by the person taking the affidavit.