s 89 Carrying out functions.
(1) For the purposes of this section the 2002 Act functions are the functions mentioned in subsection (2) of section 86 which, by virtue of that section, are concurrent functions of the CAA and the CMA . (2) Before the CMA or the CAA first carries out the 2002 Act functions in relation to a matter it must consult the other. (3) If the CMA or the CAA has carried out the 2002 Act functions in relation to a matter the other must not carry out the 2002 Act functions in relation to the matter. (4) If in carrying out the 2002 Act functions the CAA makes a market investigation reference (under section 131 of the 2002 Act ) , to help the CMA group (constituted under Schedule 4 to the Enterprise and Regulatory Reform Act 2013) which is to conduct the investigation on the reference the CAA must give to it— (a) any information the CAA has which relates to matters within the scope of the investigation and which the CMA group requests; (b) any information the CAA has which relates to matters within the scope of the investigation and which the CAA thinks it would be appropriate for it to give without a request; (c) any other help which the CAA is able to give in relation to matters within the scope of the investigation and which the CMA group requests. (5) In carrying out the investigation concerned the CMA group must take account of any information given under subsection (4).