26 44. Production of documents and data The Controller or an authorised officer may - 45. (a) require the production of records, accounts, data and documents kept by a certification authority and inspect, examine and take copies of any of them; (b) require the production of an identification document from any person in relation to any offence under this Act; (c) make such inquiry as may be necessary to ascertain whether this Act has been complied with; (d) retain, for such period as he considers necessary, any record, account, data or document specified in paragraph (a) or (b). Power of access to computers and data (1) Subject to subsection (2), the Controller or an authorised officer may, at all reasonable times, enter any business premises or place where any business is carried on or anything is done in connection with the business and (a) (b) (i) have access to and inspect and check the operation of any computer system and any associated apparatus or material which he has reasonable cause to suspect is or has been in use; (ii) use or cause to be used any such computer system to search any data contained in or available to such computer system; or require (i) the person by whom or on whose behalf the Controller or authorised officer has reasonable cause to suspect the computer system is or has been so used; or (ii) any person having charge of, or otherwise concerned with the operation of, the computer system, apparatus or material,