An accidental error in a decision of the Department, or in any record of such a decision, may be corrected by the Department at any time.

Such a correction is to be treated as part of that decision or of that record.

The Department must give written notice of the correction as soon as practicable to the person to whom the decision was given.

In calculating the time within which an application may be made under regulation 5 (revision on any grounds) for a decision to be revised, no account is to be taken of any day falling before the day on which notice of the correction was given.