SUBPOENA — subpoena for production issued by defendants to third party (“the producing party”) — asserted failure by the producing party to comply over a period of six months — order made for an authorised officer of the producing party to attend court for the purpose of examination in relation to the producing party’s asserted failure to comply with the defendants’ subpoena — whether failure to comply with the subpoena established — order for compliance with the subpoena by further search and (in relation to documents asserted to be missing) by affidavit