(1) The determinations and publications of the annual volumes to be auctioned and of the bidding windows, volumes, dates, auctioned product, payment and delivery dates in connection with individual auctions pursuant to regulations 8 and 9 may not be modified except for adjustments due to any of the following -

(a) failure to sell all allowances at a preceding auction;

(aa) the calculation of the annual volume of allowances in accordance with regulation 9;

(b) the cancellation, or a change to the date or time of the opening or close of the bidding window, of an auction pursuant to regulation 11;

(c) any settlement failure referred to in regulation 28(5);

(d) allowances remaining in the new entrants reserve provided for in article 34G of the Trading Scheme Order or in the flexible reserve provided for in article 23A of that Order;

(e) any measures authorised under regulation 12;