(1) The Regulator may in accordance with Regulation 50 impose on an undertaking obligations for accounting separation in relation to specified activities related to interconnection or access. In particular, the Regulator may require an undertaking which is vertically integrated to make transparent its wholesale prices and its internal transfer prices, inter alia, to ensure compliance with any obligation imposed under Regulation 52 or, where necessary, to prevent unfair cross-subsidy.

(2) For the purpose of paragraph (1) the Regulator may specify the format and accounting methodology to be used.

(3) A requirement upon an undertaking under Regulation 98 may, in order to facilitate the verification of compliance by an undertaking with any obligations of transparency under Regulation 51, and non-discrimination under Regulation 52, include a requirement that accounting records, including data on revenue records received from third parties, are provided by any such undertaking to the Regulator on request.