Sch 7A para 44
(1) If it appears to an officer of Revenue and Customs that the period of account for which an interest restriction return has been submitted is or may be the wrong period, the power to enquire into the return includes power to enquire into the period for which the return ought to have been made. (2) If sub-paragraph (1) applies, paragraph 41 (normal time limits for opening enquiry) has effect as if the return were one that had been submitted for the correct period of account. (3) If it appears to an officer of Revenue and Customs that the worldwide group (“the relevant group”) in relation to which an interest restriction return has been submitted— (a) consists of, or may consist of, two or more worldwide groups, (b) includes, or may include, entities that are members of a different worldwide group or groups, or (c) does not include, or may not include, entities that should be members of the relevant group, the power to enquire into the return includes power to enquire into the returns for the periods of account of the worldwide groups which ought to have been made.