21(1)This paragraph applies where—U.K.
(a)information has been provided under paragraph 11(1), or 12(1) about any notifiable arrangements, or proposed notifiable arrangements, to which a reference number is allocated under paragraph 22, and
(b)after the provision of the information, there is a change in relation to the arrangements of a kind mentioned in sub-paragraph (2).
(2)The changes referred to in sub-paragraph (1)(b) are—
(a)a change in the name by which the notifiable arrangements, or proposed notifiable arrangements, are known;
(b)a change in the name or address of any person who is a promoter in relation to the arrangements or, in the case of proposed arrangements, the notifiable proposal.
(3)A person who is a promoter in relation to the notifiable arrangements or, in the case of proposed notifiable arrangements, the notifiable proposal must inform HMRC of the change mentioned in sub-paragraph (1)(b) within 30 days after it is made.
(4)Sub-paragraphs (5) and (6) apply for the purposes of sub-paragraph (3) where there is more than one person who is a promoter in relation to the notifiable arrangements or proposal.
(5)If the change in question is a change in the name or address of a person who is a promoter in relation to the notifiable arrangements or proposal, it is the duty of that person to comply with sub-paragraph (3).
(6)If a person provides information in compliance with sub-paragraph (3), the duty imposed by that sub-paragraph on any other person, so far as relating to the provision of that information, is discharged.