“Insofar as a document is in the physical possession of a third party, meaning a person who is not a party to the action, that document is in the control of the party to the action not only where the party has a legally enforceable right to obtain access to such a document, but also where there is a standing or continuing practical arrangement between the party and the third party whereby the third party allows the party access to the document, even if the party has no legally enforceable right of such access ... However, in order to establish that there is such a standing or continuing arrangement or even a specific, time-limited arrangement, whereby a third party allows a party to the action access to the document which the third party has in its possession, it is not generally sufficient to demonstrate that there is a close legal or commercial relationship between the party and third party, such as parent and subsidiary companies or employer and employee relationships; something more is required; there must be more specific and compelling evidence of such an arrangement ...”