An appellant may amend a notice of grounds of appeal at any time before the preliminary hearing and shall promptly notify any person to whom a copy of the notice was sent pursuant to regulation 5(2) of the amendment.

An appellant may amend a notice of grounds of appeal in the course of the preliminary hearing with the leave of the chairman or at any time thereafter with the leave of the Tribunal.

The chairman or the Tribunal shall not give such leave unless he or it has afforded the Commission an opportunity of making representations on the proposed amendment.

Leave may be granted on such terms (if any), including terms as to costs or expenses, as the chairman or the Tribunal thinks fit.

Where a notice of grounds of appeal is amended with leave the appellant shall promptly notify any person to whom a copy of the notice was sent pursuant to regulation 5(2) of the amendment.