21. In regulation 20 (application of regulations 20, 20A, 27, 29, 37, 41, 42, 43 and 44 of the Principal Regulations)—
(a)in the heading—
(i)omit “20A,” and “29,”;
(ii)after “27A,” insert “27B,”;
(b)in paragraph (1)—
(i)omit “20A (provisions applicable to third party certification schemes),”;
(ii)for “27A (fabric energy efficiency rate calculations),” substitute “27A (primary energy consumption rate calculations),”;
(iii)after “27A (primary energy consumption rate calculations),” insert “27B (fabric performance values calculations),”;
(iv)after paragraph (2A) insert—
“(2B) Regulation 27B(3) of the Principal Regulations applies in relation to building work which is the subject of an initial notice as if after “work has been completed,” there were inserted “or, if earlier, the date on which in accordance with regulation 17 of the Building (Approved Inspectors etc.) Regulations 2010 the initial notice ceases to be in force.”